Messages in this thread | | | Date | Mon, 12 Mar 2007 20:01:16 -0700 | From | "Nish Aravamudan" <> | Subject | Re: Stracing Amanda (was: RSDL for 2.6.21-rc3- 0.29) |
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On 3/12/07, Gene Heskett <gene.heskett@gmail.com> wrote: > On Monday 12 March 2007, Douglas McNaught wrote: > >Patrick Mau <mau@oscar.ping.de> writes: > >> Why not temporarly replace "/bin/tar" with a shell script that does: > >> > >> #!/bin/sh > >> exec strace -f -o output /bin/real.tar $@ > > > >You beat me to it. :) I've done that before; it's a great suggestion. > > > >Except that if you expect 'tar' to be invoked multiple times in a run, > >you should probably use 'output.$$' for the output filename so things > >don't get clobbered. > > > >-Doug > > In my case, Doug, it will get invoked 64 times, amanda does a dummy run to > get an estimate, calculates what to do based on that output which is 32 > runs, 1 per disklist entry and I have 32, and then reruns tar with the > appropriate level options against each individual disklist entry. > > But I'm puzzled a bit, what does the double $$ do?, or it buried someplace > in the bash manpage? Its not something I've stumbled over yet.
buried indeed:
"Special Parameters: ... $ Expands to the process ID of the shell. In a () subshell, it expands to the process ID of the current shell, not the sub‐ shell. "
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