Posts for the month of August 2004

Cool rescue CD system

Print everything after the last occurrence

This may be long and convoluted but it is the first thing that came to mind and it worked.

Had a log file that would delimit with "As Of nn/nn/nnnn" which could be multimegabytes. Didn't feel like doing a perl solution that day, so:

grep -n 'As Of' sourcefile | tail -1 | awk -F":" '{print $1}' | xargs -r -iX awk 'FNR>=X' sourcefile > outfile

Again, likely an easier solution, but this was Q&D.

More cpio tricks

Cleaning out my desk and came across these notes…

find /mnt/old_root -depth -print | cpio -odv | gzip -c -v -1 > /opt/bad_disk/old_root.cpio.gz

find -depth -print | cpio -odv > tempo.cpio
cpio -idvm < tempo.cpio

Neat trick:

tar cf - . | (cd /usr/local ; tar xvf - ) 

Peeking on a process

We have a problem at work with an ssh failing, but I don't have access to the source of the program running ssh. So I replaced ssh with this script, renaming the old ssh to ssh_orig. The extra flags on ssh were just me seeing if I can get the thing to work, you can ignore them:

echo $* >> /tmp/ssh-$$-in
ssh_orig -C -2 -x $* | tee /tmp/ssh-$$-out

This creates a bunch of files in /tmp/ with the input command line string given to the script in the -in files and the output in the -out files.

Note, this will probably cause a security audit problem since you messed with ssh. ;)

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