![]() $ echo "abcdef" > c.txt echo "defabc" > d. Using Mac OS X terminal to copy a selection of folders to a new location, with merge behavior. It looks like the new version of OSX no longer supports grep -P and as such has made some of my scripts stop working. How can I do the same thing with perl Basically, I would like to change the following so that it exits with status 1 if no. This will print the names of all files where "pattern2" appears after "pattern1", or where both appear on the same line: $ echo "abc With grep I get a failure return code/exit status if no result is found. Tail $f -n $(grep -n "pattern1" $f | head -n1 | cut -d : -f 1) 2>/dev/null \ The name stands for Global Regular Expression Print. When no regular expression type is specified, grep interpret search patterns as basic regular expressions. Introduction Grep is a powerful utility available by default on UNIX-based systems. ![]() Formatted more readably: for f in FILEGLOB do GNU grep supports three regular expression syntaxes, Basic, Extended, and Perl-compatible. This is highly experimental and grep -P may warn ofĪs an alternative to Balu Mohan's answer, it is possible to enforce the order of the patterns using only grep, head and tail: for f in FILEGLOB do tail $f -n $(grep -n "pattern1" $f | head -n1 | cut -d : -f 1) 2>/dev/null | grep "pattern2"
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