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Ten perl one-liner tips and tricks...
The core of any perl one-liner is the -e switch, which lets you pass a snippet of code on the command-line:

perl -e 'print "hi\n"' prints "hi" to the console.

The second standard trick to perl one-liners are the -n and -p flags. Both of these make perl put an implicit loop around your program, running it once for each line of input, with the line in the $_ variable. -p also adds an implicit print at the end of each iteration.
 read more | mail this link | score:8679 | -Ray, June 1, 2010
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