Linux Commands

touch <filename>	Create a file
touch .<filename>	Creates a hidden file
pwd	Displays current directory path
whoami	Displays current user id and name
w	Display who is logged in and what they are doing
ls	Lists files and directories
ls -l	Lists files and directories, size, modified date and time, its permission
ls -a	Lists files and directories along with hidden
ls -F	Lists files and directories where directories has a / at the end
ls ?.*	Lists files with single character and any extension
ls ?.doc	Lists files with single character and doc extension
ls a*.doc	Lists files with started character a after that any letters and doc extension
ls *.doc	Lists files with only doc extension
ls [a-d]*.doc	Lists files with only doc extension and name should be between a to d
cat <file>	Displays content of file
cat ><file>	Creates file and takes input
cat <file> <file>	Displays content of two files
cat >><file>	Displays content of file and takes input
cp <file> <file>	Copy one file to other
mv <file> <file>	Copy/Renames file from one location to other
rm <file>	Removes file
rm <Dir>	Removes empty directory
rm -r <Dir>	Removes non empty directory