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03-13-2008
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Get the line number of an unknown line
I need to get the line number for a line, but I don't know where the file the line will appear.
The line is always constant, but appears in different places. ie abc bcd cde fff aaa bbb ccc ddd and I would need the line number for fff, any help on this would be greatly appreciated. |
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03-13-2008
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Code:
cat test.txt | perl -ne 'print "$.\n" if $_ eq "fff\n"' There are several variations on this you can use, but this should work. If you prefer a regex, or don't care if the line match is inexact, you can do it this way: Code:
cat test.txt | perl -ne 'print "$.\n" if $_ =~ /fff/' This way, you don't need to specify the \n. Here's a more explicit version: Code:
cat test.txt | perl -ne 'print "$.\n" if $_ =~ /^fff$/' The ^ indicates the beginning of the line, and the $ indicates the end of the line. So this will match it only if "fff" is the entire content of the line. If you want it to be case-insensitive, add "i" after the final backslash: Code:
cat test.txt | perl -ne 'print "$.\n" if $_ =~ /^fff$/i' |
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