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+#/usr/bin/bash
+
+# calculs arythmétiques
+a=2
+b=5
+# addition
+c=$((a+b))
+echo $c
+# incrémentation
+((c++))
+echo $c
+# entier négatif
+c=$((a-b))
+echo $c
+# division entière
+c=$((b/a))
+echo $c