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Linux Dollar Question Mark ($?)This control operator is used to check the status of last executed command. If status shows '0' then command was successfully executed and if shows '1' then command was a failure. The exit code of the previous command is stored in the shell variable $?. It is a shell parameter and not a variable as you can't assign a value to it. Syntax: 
Look at the above snapshot, at first time, all the directories have been deleted successsfully and hence $? shows the value '0'. But in the second time, command was failed to delete the directories and hence shows the value '1'.
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