add shell.md

IT/linux/shell.md

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+#shell
+
+##tips
+
+- setter IFS au retour chariot
+``` IFS=$'\n'```
+
+## boucle
+```
+for var in $variable
+do
+     commande
+done
+```
+
+
+## if
+
+```
+if [ test ]; then
+        echo "C'est vrai"
+else
+	echo "c'est faux"
+fi
+```
+
+### test
+#### string
+|test|def|
+|----|---|
+|$a = j$b|egale|
+|$a != $b|different|
+|-z $a|est vide|
+|-n $a|est non vide|
+
+#### int
+
+|test|def|
+|----|---|
+|$a -eq $b|egale|
+|$a -ne $b|non egale|
+|$a -lt $b| < |
+|$a -le $b| <= |
+|$a -gt $b| >|
+|$a -ge $b| >= |
+
+
+#### file 
+
+|test|def|
+|----|---|
+|-e $a|exist|
+|-d $a |is directory|
+|-f $a | is file|
+|-L $a | is symbolic link|
+|-r -w -x | test permition|
+|$a -nt $b| $a plus récent|
+|$a -ot $b| $a plus vieux|