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Old

Shortest command to calculate the sum of a column of output

Posted 06-02-2010 at 06:27 AM by bittner (Notes on Linux)
I had to calculate the Installed-Size for a .deb control file recently. Here is the solution I came up with:

Code:
dpkg-deb -c mypackage.deb | sed -e 's/.*root\s*//' -e 's/\s*2010-.*$//' | xargs | tr ' ' + | bc
What it does? The code tries to construct a calculation string and feeds it to the command line calculator bc as follows:
  1. use dpkg-deb to get the file size information out of the Debian package
  2. sed away all characters before and after the
...
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Old

Unix runlevel scripts: Finally the first character makes sense!

Posted 05-29-2010 at 04:12 PM by bittner (Notes on Linux)
You probably know Unix runlevel scripts. They start with an S or a K, and they are typically located at /etc/rcX.d/ with X being the runlevel (0-6) the script is supposed to run at. For example:
Code:
~$ ls -l /etc/rc5.d/*cups
lrwxrwxrwx 1 root root 14 2009-12-31 16:35 /etc/rc5.d/S50cups -> ../init.d/cups
To be precise those S- and K- files are typically symbolic links to scripts that reside in /etc/init.d/, and from my experience I felt they work as follows:
  • Any symlink
...
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