Zaahir Moolla
commit
15d0985090
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@ -0,0 +1,463 @@
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{
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"id": "bash_cheat_sheet",
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"name": "Bash",
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"description": "Bourne-Again shell",
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"metadata": {
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"sourceName": "Bash Reference Manual",
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"sourceUrl": "https://www.gnu.org/software/bash/"
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},
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"section_order": [
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"Lingo",
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"Shortcuts",
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"Special Variables",
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"Standard File Descriptors",
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"Arithmetic Operators",
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"IO Redirection",
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"Expansion And Other Operators",
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"Exit Statuses",
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"Auto-Completion",
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"Misc"
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],
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"sections": {
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"Lingo": [
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{
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"key": "C",
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"val": "Ctrl"
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},
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{
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"key": "M",
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"val": "Meta Key (Alt or ESC)"
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}
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],
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"Shortcuts": [
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{
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"key": "C-c",
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"val": "Interrupt running process"
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},
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{
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"key": "C-z",
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"val": "Suspend running process"
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},
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{
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"key": "C-d",
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"val": "Exit from current shell"
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},
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{
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"key": "C-l",
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"val": "Clear Screen"
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},
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{
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"key": "C-a",
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"val": "Move at the start of the line"
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},
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{
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"key": "C-e",
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"val": "Move at the end of the line"
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},
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{
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"key": "M-←",
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"val": "Move backward by a word"
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},
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{
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"key": "M-b",
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"val": "Move backward by a word (alternative)"
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},
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{
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"key": "M-→",
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"val": "Move forward by a word"
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},
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{
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"key": "M-f",
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"val": "Move forward by a word (alternative)"
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},
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{
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"key": "[C-x], [C-x]",
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"val": "Move cursor between start of line and current position"
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},
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{
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"key": "M-t",
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"val": "Swap the last two words before the cursor"
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},
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{
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"key": "C-t",
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"val": "Swap the last two characters before the cursor"
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},
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{
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"key": "M-Backspace",
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"val": "Delete a word (backward)"
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},
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{
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"key": "C-w",
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"val": "Delete a word (backward) (alternative)"
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},
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{
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"key": "M-d",
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"val": "Delete a word (forward)"
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},
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{
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"key": "C-h",
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"val": "Delete one character backward (same as Backspace)"
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},
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{
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"key": "C-k",
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"val": "Kill from cursor to the end of line"
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},
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{
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"key": "C-u",
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"val": "Kill from cursor to the beginning of line"
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},
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{
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"key": "M-u",
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"val": "Upper-case from cursor to the end of word"
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},
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{
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"key": "M-l",
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"val": "Lower-case from cursor to the end of word"
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},
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{
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"key": "M-c",
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"val": "Capitalize word (from cursor position)"
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},
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{
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"key": "C-y",
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"val": "Paste"
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},
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{
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"key": "C-_",
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"val": "Undo"
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},
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{
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"key": "M-r",
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"val": "Revert to original command (before editing it)"
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},
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{
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"key": "C-p",
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"val": "Get previous command"
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},
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{
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"key": "C-n",
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"val": "Get next command"
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},
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{
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"key": "[C-r], [<pattern>]",
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"val": "Search previous command containing <pattern>"
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},
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{
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"key": "M-.",
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"val": "Insert last argument of last command"
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},
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{
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"key": "[M-<N>], [C-M-y]",
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"val": "Get Nth argument of previous command (N=0 gives the command)"
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},
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{
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"key": "M-<",
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"val": "Insert oldest command from history"
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},
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{
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"key": "[C-x], [C-v]",
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"val": "Show bash version"
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},
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{
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"key": "[C-x], [C-e]",
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"val": "Edit current line with ${EDITOR}"
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}
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],
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"Special Variables": [
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{
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"key": "!$",
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"val": "Last argument of last command"
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},
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{
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"key": "$<N>",
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"val": "Nth argument of current process (positional parameter)"
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},
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{
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"key": "$#",
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"val": "Number of arguments given to current process"
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},
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{
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"key": "$@",
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"val": "Command line arguments for current process"
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},
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{
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"key": "$*",
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"val": "Without quotes, same as '$@'"
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},
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{
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"key": "\"$*\"",
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"val": "Command line arguments for current process, expanded to a single argument"
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},
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{
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"key": "$0",
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"val": "The name of the shell program"
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},
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{
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"key": "$?",
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"val": "Exit code of previous command"
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},
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{
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"key": "$$",
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"val": "PID of current shell or script"
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},
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{
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"key": ":",
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"val": "Dummy placeholder (produces no output)"
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},
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{
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"key": "!-<N>",
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"val": "Execute Nth command from history"
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},
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{
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"key": "!!",
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"val": "Execute last command"
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},
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{
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"key": "!<string>",
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"val": "Execute last command starting with <string>"
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}
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],
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"Standard File Descriptors": [
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{
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"key": "0",
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"val": "stdin"
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},
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{
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"key": "1",
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"val": "stdout"
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},
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{
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"key": "2",
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"val": "stderr"
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}
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],
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"Arithmetic Operators": [
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{
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"key": "+",
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"val": "Addition"
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},
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{
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"key": "-",
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"val": "Subtraction"
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},
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{
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"key": "++",
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"val": "Increment"
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},
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{
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"key": "--",
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"val": "Decrement"
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},
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{
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"key": "*",
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"val": "Multiplication"
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},
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{
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"key": "/",
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"val": "Division"
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},
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{
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"key": "**",
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"val": "Exponentiation"
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},
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{
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"key": "<<",
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"val": "Bit-shift left"
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},
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{
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"key": ">>",
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"val": "Bit-shift right"
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},
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{
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"key": "<",
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"val": "Comparison (less than)"
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},
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{
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"key": "-lt",
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"val": "Comparison (less than) (alternative)"
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},
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{
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"key": "<=",
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"val": "Comparison (less than or equal)"
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},
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{
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"key": "-le",
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"val": "Comparison (less than or equal) (alternative)"
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},
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{
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"key": ">",
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"val": "Comparison (greater than)"
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},
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{
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"key": "-gt",
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"val": "Comparison (greater than) (alternative)"
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},
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{
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"key": ">=",
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"val": "Comparison (greater than or equal)"
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},
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{
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"key": "-ge",
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"val": "Comparison (greater than or equal) (alternative)"
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},
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{
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"key": "==",
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"val": "Comparison (equal)"
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},
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{
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"key": "!=",
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"val": "Comparison (not equal)"
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},
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{
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"key": "&",
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"val": "Bitwise AND"
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},
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{
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"key": "^",
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"val": "Bitwise exclusive OR"
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},
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{
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"key": "|",
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"val": "Bitwise OR"
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},
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{
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"key": "&&",
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"val": "Logical AND"
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},
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{
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"key": "||",
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"val": "Logical OR"
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}
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],
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"IO Redirection": [
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{
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"key": "cmd > file",
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"val": "Send cmd output to file (overwrite)"
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},
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{
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"key": "cmd >> file",
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"val": "Send cmd output to file (append)"
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},
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{
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"key": "cmd < file",
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"val": "Contents of file are passed to cmd's stdin"
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},
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{
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"key": "cmd1 | cmd2",
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"val": "Output of cmd1 is passed to cmd2's stdin"
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},
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{
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"key": "cmd &> file",
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"val": "Redirect both stdout and stderr to file (overwrite)"
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},
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{
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"key": "cmd &>> file",
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"val": "Redirect both stdout and stderr to file (append)"
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},
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{
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"key": "cmd >&n",
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"val": "Send cmd's stdout to file descriptor n"
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},
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{
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"key": "cmd m>&n",
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"val": "Same as above except that output that would normally go to file descriptor m, will also go to n"
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},
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{
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"key": "cmd <&n",
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"val": "File descriptor n becomes stdin for cmd"
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},
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{
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"key": "cmd m<&n",
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"val": "Same as above except that stdin that would normally come from file descriptor m, will now come from n"
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},
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{
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"key": "cmd >&-",
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"val": "Close stdout"
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},
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{
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"key": "cmd <&-",
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"val": "Close stdin"
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}
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],
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"Expansion And Other Operators": [
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{
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"key": "${var:-val}",
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"val": "If $var exists and isn't NULL, return its value; otherwise return val"
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},
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{
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"key": "${var:=val}",
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"val": "If $var exists and isn't NULL, return its value; otherwise set it to val and then return its value"
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},
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{
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"key": "${var:?val}",
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"val": "If $var exists and isn't NULL, return its value; otherwise return 'var: val' and abort"
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},
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{
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"key": "${var:?}",
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"val": "If $var exists and isn't NULL, return its value; otherwise return 'var: parameter null or not set' and abort"
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},
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{
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"key": "${var:+val}",
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"val": "If $var exists and isn't NULL, return val; otherwise return NULL"
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},
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{
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"key": "$((...))",
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"val": "Arithmetic Expansion"
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},
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{
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"key": "${#var}",
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"val": "String length operator"
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}
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],
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"Exit Statuses": [
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{
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"key": "0",
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"val": "Success"
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},
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{
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"key": "!=0",
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"val": "Failure"
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}
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],
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"Auto-Completion": [
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{
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"key": "TAB",
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"val": "Auto-complete (hit twice when ambiguous)"
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},
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{
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"key": "[~], [TAB] [TAB]",
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"val": "Display all users from /etc/passwd"
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},
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{
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"key": "[$], [TAB] [TAB]",
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"val": "Display all system variables"
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},
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{
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"key": "[<string>], [M-/]",
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"val": "Auto-complete/display files and directories starting with <string>"
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},
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{
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"key": "[<string>], [M-?]",
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"val": "Display commands starting with <string>"
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},
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{
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"key": "M-*",
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"val": "Insert all possible completions"
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}
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],
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"Misc": [
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{
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"key": "a=$(cmd)",
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"val": "$a now holds cmd's output"
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},
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{
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"key": "a=`cmd`",
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"val": "$a now holds cmd's output (alternative)"
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},
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{
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"key": "cmd &",
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"val": "Execute cmd in the background (fork)"
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}
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]
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}
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}
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Loading…
Reference in New Issue