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- -bash-4.4$ toto=a ; titi=b
- -bash-4.4$ echo $toto-$titi
- a-b
- -bash-4.4$ unset toto
- -bash-4.4$ echo $toto-$titi
- -b
- -bash-4.4$ unset titi
- -bash-4.4$ echo $toto-$titi
- -
- -bash-4.4$ #ok?
- -bash-4.4$
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