WebFor example, a C shell script should have as the first line: #!/bin/csh Script files should be given "execute" file permission with the chmod command: ... - logical negation % - remainder / - divide * - multiply - - subtract + - … WebAug 8, 2012 · expr is an external program used by Bourne shell(i.e. sh).Bourne shell didn't originally have any mechanism to perform simple arithmetic. It uses expr external program with the help of backtick.. The backtick(`) is actually called command substitution .Command substitution is the mechanism by which the shell performs a given set of commands and …
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