calcul en shell
a=1; let a++; echo $acalcul en shell
a=1; let a++; echo $acalcul en shell
$ a=1
$ let "a=$a + 1"
$ echo $a
2calcul en shell
$ a=1
$ a=$(echo "$a+1" |bc )
$ echo $a
2calcul en shell
$ a=1
$ a=$(($a + 1))
$ echo $a
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