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Safe Ch
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> more safech.chs
#!/bin/chs
rm  /bin/ls
> safech.chs
ERROR: variable 'rm' not defined
ERROR: command 'rm' not found
ERROR: syntax error before or at line 2 in file 'safech.chs'
==>: rm  /bin/ls
BUG: rm  /bin/ls<== ???
>
Note: Safe Ch does not allow unsafe commands such as "rm" etc.