LINUX: where there is a shell, there is a way.

Below is the list of common Linux commands that I used at work:

cat, cd, clear, chmod, cp, df, diff, du, find, get, grep, history, ln, ls, mkdir, mv, ping, pwd, rm, sed, service, shutdown, tar, telnet, touch, unzip, vim.

For any command that I do not know the purpose of, I used to type: man "command name" to get a help menu for that command. Ex: man get.

Now I just google it.
For editing files in Linux, I use: vim. (vim is a superset of vi. So, everything that is in vi is available in vim.)

Common vim commands I used:

i -- insert before current cursor

a -- insert after current cursor

gg -- goes to start of file.

0 -- goes to beginning of the line.

$ -- goes to end of the line.

nG -- goes to nth line.

:set nu -- set line number infront of each line.

:set wrap -- wrap long lines.

:w -- to save file any time.

:wq -- save data and quit.

:q! -- quit without saving.

:wq! -- save change in file opened in read-only mode.

:%s -- search and replace

Networking commands some I use often, some I rarely used:

hostname -- find host and domain name.

ping -- test net work connection.

ifconfig -- getting network configuration.

netstat -- print network connection, routing tables, interface statistic.

telnet -- communicate with another hostname.

finger -- view user information.

nslookup -- Query DNS lookup name

traceroute -- prints steps that packets take to get to the network host.