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One liner to kill a process when knowing only the port where the process is running
-k (kill option ) . To kill all processes accessing this port

See system users

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Use QuickLook from the command line without verbose output

Tail a log-file over the network
it also works with the chrome browser. The alternative with tail and nc doesn't

list the top 15 folders by decreasing size in MB
list the top 15 folders by decreasing size in MB

Change proccess affinity.
Set the affinity of a process to a particular core(s). Arguments for processor include a comma separated list, or a range. (example: 1,2 or 0-3) You can use top in smp mode (Press 1) to see the changes to the affinity.

Suspend to ram
Using sys

Rsync remote data as root using sudo
If your user has sudo on the remote box, you can rsync data as root without needing to login as root. This is very helpful if the remote box does not allow root to login over SSH (which is a common security restriction).

Hits per hour apache log


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