Some Linux Command that I found useful

Here are some linux command I found useful in my day to day work.
This is not a full list of LINUX commands. recently started working with LINUX. So this is a set of simple commands I found useful.

whatis

It provides very brief descriptions of command line programs and other topics related to Linux and other Unix-like operating systems.whatis searches a set of database files containing short descriptions of system commands for keywords and displays the result

whatis head
whatis head tail

source

source is a bash shell built-in command that executes the content of the file passed as argument, in the current shell. It has a synonym in '.' (period).

source .cshrc

ls -la ~/ | more

Find hidden files on a directory

Move files from one place to another

mv /home/jack/testfile /home/jack/testfile2
mv testfile testfile2
mv /home/jack/testfile /home/jack/Documents/