Collection of Perl one liners. The Camel ownz j00 all :)
PERL:
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# run contents of "my_file" as a program
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$ perl my_file
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# run debugger "stand-alone"
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$ perl -d -e 42
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# run program, but with warnings
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$ perl -w my_file
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# run program under debugger
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$ perl -d my_file
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# just check syntax, with warnings
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$ perl -wc my_file
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# useful at end of "find foo -print"
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$ perl -nle unlink
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# simplest one-liner program
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$ perl -e 'print "hello world! "'
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# add first and penultimate columns
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$ perl -lane 'print $F[0] + $F[-2]'
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# just lines 15 to 17
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$ perl -ne 'print if 15 .. 17' *.pod
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# in-place edit of *.c files changing all foo to bar
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$ perl -p -i.bak -e 's/\bfoo&\b/bar/g' *.c
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# command-line that prints the first 50 lines (cheaply)
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$ perl -pe 'exit if $.> 50' f1 f2 f3 ...
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# delete first 10 lines
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$ perl -i.old -ne 'print unless 1 .. 10' foo.txt
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# change all the isolated oldvar occurrences to newvar
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$ perl -i.old -pe 's{\boldvar\b}{newvar}g' *.[chy]
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# command-line that reverses the whole file by lines
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$ perl -e 'print reverse <>' file1 file2 file3 ....
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# find palindromes
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$ perl -lne 'print if $_ eq reverse' /usr/dict/words
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# command-line that reverse all the bytes in a file
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$ perl -0777e 'print scalar reverse <>' f1 f2 f3 ...
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# command-line that reverses the whole file by paragraphs
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$ perl -00 -e 'print reverse <>' file1 file2 file3 ....
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# increment all numbers found in these files
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$ perl i.tiny -pe 's/(d+)/ 1 + $1 /ge' file1 file2 ....
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# command-line that shows each line with its characters backwards
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$ perl -nle 'print scalar reverse $_' file1 file2 file3 ....
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# delete all but lines beween START and END
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$ perl -i.old -ne 'print unless /^START$/ .. /^END$/' foo.txt
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# binary edit (careful!)
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$ perl -i.bak -pe 's/Mozilla/Slopoke/g' /usr/local/bin/netscape
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# look for dup words
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$ perl -0777 -ne 'print "$.: doubled $_&\n" while /\b(&\w+)\b\s+\b\1\b/gi'
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# command-line that prints the last 50 lines (expensively)
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$ perl -e 'lines = <>; print @@lines[ $#lines .. $#lines-50' f1 f2 f3 ...
said, on 04/May/04 at 12:13 am # :
FirstPost
(Au cas ou)
:PP