2010-11-05

"multi-strace"

Thanks to a colleague, we hereby present the multi-strace:
strace $(pgrep httpd | awk '{ print "-p " $1 }' | tr '\n' ' ')
(it's left as exercise to the reader to understand what it does) if you want to save the output and the play with it, just add '-o <file>'.

Welcome, new handy tool!
a

5 comments:

  1. Leo AntunesNovember 5, 2010 at 1:23 PM

    For completeness' sake, you could also use:
    # pgrep httpd | sed 's/^/-p /' | xargs strace

    Seems a bit easier to read, IMHO. Though naturally not so cool! :)

    BTW, it seems xargs could use some sort of argument like "automatically prepend arguments with X". Would neatly make this sort of hack useless.

    ReplyDelete
  2. AnonymousNovember 5, 2010 at 4:21 PM

    Also can be written as:

    strace $(printf -- '-p %s ' $(pgrep httpd) )

    Thanks for sharing :)

    ReplyDelete
  3. AnonymousNovember 5, 2010 at 5:41 PM

    Or

    strace -p$(pgrep -d\ -p httpd)

    ReplyDelete
  4. AnonymousNovember 6, 2010 at 7:17 PM

    I usually use:

    for i in $(ps -eLf |grep NAME |awk '{print $4}'); do (strace -p $i 2>&1 &); done

    ReplyDelete
  5. AnonymousNovember 6, 2010 at 8:38 PM

    Leo, you mean like this:
    pgrep httpd | xargs -i strace -p {}

    ReplyDelete