Misc

How do I find how long ago a Linux system was installed ?

# tune2fs -l /dev/dm-0  | grep 'Filesystem created:'
Filesystem created:       Thu Feb  4 05:46:35 2016

Sort files/directories by size

du -skh * | sort -rn

List opened files for a specific thread

When we have a process with many threads and we're looking for opened files for a specific child we could proceed that way:

• Get the PiD with ps / top / whatever.
• Get the TiD (thread id) we are interested in.
• Execute the following command (replace PiD & TiD with expected values):

ls -l /proc/PiD/task/TiD/fd

Prevent Bash to stop after the 1st command when you paste a bunch of cmds

Add: < "/dev/null" at the end. Ex:

rsync -avz 172.16.2.1:/var/cache/nginx/ /var/cache/nginx/ < "/dev/null"
rsync -avz 172.16.2.1:/usr/share/stickyadstv/ /usr/share/something/ < "/dev/null"