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"Shell and environment"
Summary:
To find the PID of a running UNIX/XWindow process:
$ xprop _NET_WM_PID
If that fails:
$ ps -ww -fp <PID>
$ pwdx <PID>
Detailed explanation:
So How can you find the PID (not Window ID!) of a running UNIX/XWindow process?
Method 1 (simple):
$ xprop […]
Being able to see seconds in the UNIX ‘ls’ command is particularly useful for comparing/viewing recently created files, because by default ‘ls -l’ will simply show “Today” in the date/time field for such files.
Here’s how you can make ‘ls’ show also the seconds (and not only seconds but also microseconds, for that matter… […]
Using Kdiff3 tool as example action to add to the SendTo menu of Thunar.
Create the following file in ~/.local/share/Thunar/sendto and name it <whatever>.desktop (I named mine ‘kdiff3.desktop’) :
# kdiff3.desktop – Integrate kdiff3 into
# the “Send To” menu.
[Desktop Entry]
Type=Application
Version=1.0
Encoding=UTF-8
TryExec=kdiff3
Exec=kdiff3 %F
Problem:
A site contains data which is of interest to us. The data is uniformly structured and available for examination by the general public (i.e. no login required) but is not automatically accessible, i.e. viewing it requires repetitive user interaction (such as setting a date range, clicking a ‘submit’ button, etc). In addition, usually the […]
Use imagemagick – this is exactly what it was designed for! 🙂
For example:
– to resize all .jpeg files in the current directory to be 320 pixels wide, preserving the aspect ration, do this:
 $ convert ‘*.jpeg[320x]’ resized%03d.jpeg
– to shrink all .jpg files in the current directory […]
Here’s how to list all packages whose names start with ‘nss’
yum info -v nss* | grep -v Committer | grep -w ‘Name\|Version\|Release\|Description\|Repo’
Here’s how to list all INSTALLED packages whose names start with ‘nss’
yum info -v nss* | grep -A12 -B5 -w ‘installed’ | grep -v Committer | grep -w ‘Name\|Version\|Release\|Description\|Repo\|installed’
And since […]
Creating this post to dump here various bash shell and script commands, tips and tricks which I found useful in my everyday work. Will update it with new info continually…
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Check in bash if a file exists or not and do something in each case:
if [ -f $FILE ]; then echo […]
