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Re^2: Favourite One-liners?

by sfink (Deacon)
on Jun 28, 2005 at 19:18 UTC ( #470772=note: print w/replies, xml ) Need Help??

in reply to Re: Favourite One-liners?
in thread Favourite One-liners?

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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