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Licence de l’article: Free Documentation License
Dossier: Programmation shell

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Les variables spéciales en shell

le lundi 14 décembre 2009 par Noplay

sommaire

$#
$*
$@
$ ?
$$
$ !
$_
$0 $1 $2




$#

$# Contient le nombre d’arguments passe a votre script

$*

$* Contient la liste des paramètres passée au script

$@

Comme $* mais il prend en compte les espaces, on récupère donc les arguments sous forme de tableau.

Par exemple pour ce code :

for var in "$*"
do
        echo $var;
done
test.sh "toto tata" tutu

Donnera :

toto tata tutu

Alors que pour ce code :

for var in "$@"
do
        echo $var;
done
test.sh "toto tata" tutu

Donnera :

toto tata
tutu

$ ?

$ ? Contient le résultat de la dernière commande exécuté

$$

Le PID du shell

$ !

Le PID de la dernière commande mise en background.

$_

Contient le dernier argument de la précédente commande.

Exemple :

# echo toto
toto
# echo $_
toto

$0 $1 $2

Ces variables contiennent les arguments passés en paramètre à votre script shell.



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