Differing Features (Linux in a Nutshell, 3rd Edition)

6.4. 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`


6.3. Common Features		7. bash: The Bourne-Again Shell