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Common Commands 2 ​

Sort ​

Sorts lines of text files by default, non-numeric.

bash
sort - sort lines of text files

Reverse Order ​

bash
sort -r file

Numeric Sort ​

bash
sort -n file

Sort By Month ​

Month format: Jan, Feb, Mar.

bash
sort -M file

Specify Column ​

Default is separated by (consecutive) spaces or tabs.

bash
sort -k 1 file

Specify Delimiter And Column ​

-k index starts from 1, the 3rd column is the user ID.

bash
sort -t ':' -k 3 -n /etc/passwd

Ignore Case ​

bash
sort -f file

Remove Duplicates ​

bash
sort -u file

Alias ​

Possible Aliases ​

bash
alias -p

Type ​

External/Internal Command ​

Can view if a command is an internal command, internal commands are compiled into the shell, different from external commands, no subprocess execution is required.

bash
type cd
bash
cd is a shell builtin
bash
type ps
bash
ps is hashed (/usr/bin/ps)

All Implementations ​

bash
type -a echo
bash
echo is a shell builtin
echo is /usr/bin/echo
echo is /bin/echo

Command Aliases ​

bash
type ll
bash
ll is aliased to `ls -alF'
bash
type -a ls
bash
ls is aliased to `ls --color=auto'
ls is /usr/bin/ls
ls is /bin/ls
bash
readlink - print resolved symbolic links or canonical file names

No need to look one by one.

bash
readlink -f /bin/vim
bash
/usr/bin/vim.basic