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11-03-2008
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$? means that the return code of the previous command. When you write a script, we need to ensure that the command has successful or not. This will be done by checking the return code of the previous command. i.e $?
Upon successful execution of command, it will return the code 0 else non-negative no. For ex: $ rm tmp $ echo $? 0 $ ls tmp ls: tmp: No such file or directory $ rm tmp rm: cannot remove `tmp': No such file or directory $ echo $? 1 |
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