notebook/IT/linux/shell.md

#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|