(lint) Anchor command start more strictly to avoid false positives.

test/runLint

@@ -14,26 +14,28 @@ gitgrep()
 unset CDPATH
 cd $(dirname "$0") ; cd ..
 
-gitgrep "\bawk\b.*-F([[:space:]]|[[:space:]]*[\"'][^\"']{2,})" \
+cmdstart='(^|[[:space:]]|\()'
+
+gitgrep $cmdstart"awk\b.*-F([[:space:]]|[[:space:]]*[\"'][^\"']{2,})" \
     'awk with -F char or -F ERE, use -Fchar instead (Solaris)'
 
-gitgrep "\bawk\b.*\[:[a-z]*:\]" \
+gitgrep $cmdstart"awk\b.*\[:[a-z]*:\]" \
     'awk with POSIX character class not supported in mawk (Debian/Ubuntu)'
 
-gitgrep '\bsed\b.*\\[?+]' \
+gitgrep $cmdstart'sed\b.*\\[?+]' \
     'sed with ? or +, use POSIX BRE instead (\{m,n\})'
 
-gitgrep '\bsed\b.*\\\|' \
+gitgrep $cmdstart'sed\b.*\\\|' \
     "sed with \|, use POSIX BRE (possibly multiple sed invocations) or another tool instead"
 
 # TODO: really nonportable? appears to work fine in Linux, FreeBSD, Solaris
-#gitgrep '\bsed\b.*;' \
+#gitgrep $cmdstart'sed\b.*;' \
 #    'sed with ;, use multiple -e options instead (POSIX?) (false positives?)'
 
-gitgrep '\bsed\b.*-[^[:space:]]*[rE]' \
+gitgrep $cmdstart'sed\b.*-[^[:space:]]*[rE]' \
     'sed with -r or -E, drop and use POSIX BRE instead'
 
-gitgrep '\b[ef]grep\b' \
+gitgrep $cmdstart'[ef]grep\b' \
     '[ef]grep, use grep -[EF] instead (historical/deprecated)'
 
 # TODO: $ in sed subexpression used as an anchor (POSIX BRE optional, not in