Linux in a Nutshell, Third Edition

Differing Features

The following table is a sampling of features that are different among the three shells:

Meaning/Action	bash	csh	tcsh
Default prompt.	$	%	%
Force redirection.	>|	>!	>!
Force append.		>>!	>>!
Variable assignment.	var=val	set var=val	set var=val
Set environment variable.	export var = val	setenv var val	setenv var val
Number of arguments.	$#	$#argv	$#argv
Exit status.	$?	$status	$?
Execute commands in file.	. file	source file	source file
End a loop statement.	done	end	end
End case or switch.	esac	endsw	endsw
Loop through variables.	for/do	foreach	foreach
Sample if statement.	if [ $i -eq 5 ]	if ($i==5)	if ($i==5)
End if statement.	fi	endif	endif
Set resource limits.	ulimit	limit	limit
Read from terminal.	read	$<	$<
Make a variable read-only.	readonly		set -r
File inquiry operator; tests for nonzero size.		-s
Complete current word.	Tab		Tab
Ignore interrupts.	trap 2	onintr	onintr
Begin until loop.	until/do	until	until
Begin while loop.	while/do	while	while