LinuxAbove.com

Suppose, you have large number of .tar.gz files in your home directory which you need to move to one directory above (or any other directory). Here is a simple command using which you can save time moving each file individually

for f in *.tar.gz; do mv ./"$f" ../"$f"; done 

 This command will move all .tar.gz files in current location to above.

Watch runs a command repeatedly, displaying its output. Watch tcommand allows  to check the program output changes over time. By default, the program run every two seconds. This command is similar to tail.

watch  -d  ls  -1

To view the IP addresses of all Network Interfaces configured with your syste, execute the following command:

ip addr list

To know current logged users through SSH.

who | grep -wv ‘:0’ 

To know the history of all remote logins, use the following command:

Last  -add  |  grep  -wv  ‘0.0.0.0’

dpkg -l 

rmp –qa