Commands using ls (517)

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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Suppress output of loud commands you don't want to hear from

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).

positions the mysql slave at a specific master position
say you want to reinitialize the slave database without resetting the master positions. You stop the slave, dump the master database with --master-data=2 then execute the command on the slave and wait for it to stop at the exact position of the dump. reinit the slave db and start the slave. enjoy.

Change tha mac adresse
eth0 = the name of the interface 00:01:02:03:04:05 = the new mac adresse the same thing for wireless card $ sudo iwconfig eth1 hw ether 00:01:02:03:04:05

Your name backwards

Switch to a user with "nologin" shell
You need sudo privileges for this command. Replace username with actual username.

Dump sqlite database to plain text format
If you want edit your sqlite database in any uft8 supported editor, you can dump whole sqlite database to plain text.

Search some text from all files inside a directory

In place line numbering
Add permanent line numbers to a file without creating a temp file. The rm command deletes file10 while the nl command works on the open file descriptor of file10 which it outputs into a new file again named file10. The new file10 will now be numbered in the same directory with the same file name and content as before, but it will in fact be a new file, using (ls -i) to show its inode number will prove this.


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