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Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 700

Warning: Invalid argument supplied for foreach() in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 701

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 705

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /var/www/sdb/e/8/system.co/includes/MagicWord.php on line 722
Variables bash - system.co.free.fr

Variables bash

De system.co.free.fr.
(→Définir une variable uniquement si elle est indéfinie ou nul)
(→Définir une variable uniquement si elle est indéfinie ou nul)
Ligne 244 : Ligne 244 :
définir VAR lorsque nul :<br>
définir VAR lorsque nul :<br>
<pre>
<pre>
-
VAR=               # VAR est nul
+
VAR=               # défini VAR a nul
echo ${VAR:=valeur_par_defaut}
echo ${VAR:=valeur_par_defaut}
</pre>
</pre>

Version du 8 novembre 2020 à 08:15

Récupérée de « http://system.co.free.fr/index.php?title=Variables_bash »
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