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Re: Favourite One-liners?

by holli (Monsignor)
on Jun 28, 2005 at 07:10 UTC ( #470518=note: print w/ replies, xml ) Need Help??


in reply to Favourite One-liners?

To rebuild Active State HTML-docs when I installed something from CPAN:

perl -MActivePerl::DocTools -e "UpdateHTML(1)"
Delayed execution of a command:
perl -e "sleep(3600); `something.exe`"
Nothing fancy. Just useful.


holli, /regexed monk/


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Re^2: Favourite One-liners?
by sfink (Deacon) on Jun 28, 2005 at 19:18 UTC
    Why not justsleep 3600; something.exe? Does that not work in Windows?

    On Unix, I generally use ( sleep 60m; xterm -bg red ) & to set a timer to pop up a big red window after an hour, without tying up the shell.

    Some of my favorites:

    Scan a log file generated by strace -tt, looking for each second turnover: (should statistically find the operations requiring the most time)

    perl -lane 'print $last if ($F[0] ne $lastt); $last = $_; $lastt = $F[ +0];'
    Print out a running sum of the 3rd column of a file:
    perl -lane 'print $s += $F[2]'
    Rewrite all of the CVS/Root files in a tree (yes, this is a weird way to do it):
    find . -name 'Root' -print0 | xargs -0 perl -i -pe '$_=q(:pserver:sfin +k@cvs/usr/local/cvs)'
    Print out all the double-quoted strings in a file:
    perl -lne 'print $1 while (/\"(.*?)\"/g)' filename
    Somewhat more robust version (handles backslashes):
    perl -lne 'print $1 while (/\"((\\.|[^\"])*)\"/g)' filename
    Print out all of the C++ constructors in a set of files:
    perl -lne 'print if /(\w+)::\1/ .. /^\}/' *.cpp
    I don't know if those are really representative of my favorites. I normally just spew them out on demand, so it's difficult to think of them when I don't actually need them. The above are just the ones I've used recently enough to remember.

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