Unix in a Nutshell, 4th Edition

Support Facilities

apropos	Search for commands matching a regular expression.
complete	List the command completions for the rest of the line.
define	Define a new command.
document	Document a user-defined command.
dont-repeat	Don’t repeat this command. For use in user-defined commands.
down-silently	Same as the down command, but doesn’t print messages.
echo	Print a constant string.
else	Provide a list of alternative commands for use with if.
end	End a list of commands or actions.
help	Print list of commands.
if	Execute nested commands once if the conditional expression is nonzero.
make	Run the make program using the rest of the line as arguments.
quit	Exit GDB.
shell	Execute the rest of the line as a shell command.
source	Read commands from a named file.
up-silently	Same as the up command, but doesn’t print messages.
while	Execute nested commands while the conditional expression is nonzero.