If you are smart enough you really don't need to remember all the commands.What you have to do is just taking help from the Linux system. For this you need to remember the basic help commands which I have mentioned below.
MAN:
man intro #introduction to manual pages and basic commands, important for new users
mandb #update the man index database
man -k "any keyword" #use when you don't know command name ,just search for your keyword for required action.
for example
man -k "create filesystem" # it will search for all commands related to your serach
man --help # help for man page itself
NOTE : There are 9 sections of Manuals pages which describe each commands category from user command to kernel API and system admin commands
APROPOS:
This is the same command as "MAN" . It will show your the description of any command which you will pass your through it
e.g: apropos "create disk" # brief you all commands which contains the key words followed by apropos.
WHATIS
whatis "command" #brief info about any command
e.g. whatis ls #brief you about ls command
INFO
INFO is the same command as MAN and its uses hyperlinks , its was created to replace the MAN command
info 'command_name' # brief you about the command
LOCATE
Locate will help us to find the files with proper path
locate 'filename'
WHICH
which command show your the binary path of a command
WHEREIS
its will also show you the binary path of command but aloso give you the another file paths of the given command (e.g. man pages path, configuration file path etc)
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