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Perl Monk, Perl Meditation | |
PerlMonks |
Can I write useful perl programs on the command line?by faq_monk (Initiate) |
on Oct 13, 1999 at 02:56 UTC ( #789=perlfaq nodetype: print w/replies, xml ) | Need Help?? |
Current Perl documentation can be found at perldoc.perl.org. Here is our local, out-dated (pre-5.6) version: Yes. Read the perlrun manpage for more information. Some examples follow. (These assume standard Unix shell quoting rules.)
# sum first and last fields perl -lane 'print $F[0] + $F[-1]' *
# identify text files perl -le 'for(@ARGV) {print if -f && -T _}' *
# remove (most) comments from C program perl -0777 -pe 's{/\*.*?\*/}{}gs' foo.c
# make file a month younger than today, defeating reaper daemons perl -e '$X=24*60*60; utime(time(),time() + 30 * $X,@ARGV)' *
# find first unused uid perl -le '$i++ while getpwuid($i); print $i'
# display reasonable manpath echo $PATH | perl -nl -072 -e ' s![^/+]*$!man!&&-d&&!$s{$_}++&&push@m,$_;END{print"@m"}' Ok, the last one was actually an obfuscated perl entry. :-)
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