Linux in a Nutshell, 6th Edition

Interacting with the System

Command	Action
:r file	Read in contents of file after cursor.
:r !command	Read in output from command after current line.
:numr !command	Like above, but place after line num (0 for top of file).
:!command	Run command, then return.
!motion command	Send the text covered by motion to Unix command; replace with output.
:n,m! command	Send lines n-m to command; replace with output.
num!!command	Send num lines to Unix command; replace with output.
:!!	Repeat last system command.
:sh	Create subshell; return to file with EOF.
Ctrl-Z	Suspend editor, resume with fg.
:so file	Read and execute ex commands from file.