Everyday Linux hacks and tips

Here are some useful linux commands, i frequently use

1. Removing grep result from ps output

ps aux | grep [d]hcp

By putting brackets, we are searching for a regex and preventing grep from matching itself. Since [d]hcp doesn’t match the [d]hcp regular expression, so grep won’t show up in the results.
To understand more, play with ps, grep and regex.
Below is the ouput of above command with and without brackets.

[root@localhost ~]# ps aux | grep dhcp
   53 root     dhcpcd
   97 root     grep dhcp
[root@localhost ~]# ps aux | grep [d]hcp
   53 root     dhcpcd

For more information, have a look at this StackExchange’s answer.