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 |
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