37 lines
467 B
Bash
Executable File
37 lines
467 B
Bash
Executable File
#!/bin/rc
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rfork e
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switch($#*){
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case 0
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n=1
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case 1
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n = $1
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case *
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echo usage: $0 [n] >[1=2]
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exit usage
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}
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ifs='
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'
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p=`{echo -n $prompt(1) | sed 's/[.*+?[\]()|\^$\/\\]/\\&/g'}
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awk '
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BEGIN {
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n='^$n^' + 1;
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for(i = 0; i < n; i++)
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a[i] = 0;
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}
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/^'^$p^'/ {
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for(i = 0; i < n-1; i++)
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a[i] = a[i+1];
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a[n-1] = 0;
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}
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{
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a[n-1] += length($0) + 1;
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}
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END {
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s = 0;
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for(i = 0; i < n; i++)
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s += a[i];
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for(i = 0; i < s; i++)
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printf("\b");
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}
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' /dev/text
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