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Script interacts with user , based on user input it operates

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http://www.unix.com – i have a script which takes input from user, if user gives either Y/y then it should continue, else it should quit by displaying user cancelled. Code: #!/bin/sh echo " Enter your choice  to continue y/Y  OR n/N to quit " read A if [ "$A" = "y" || "$A" = "Y" ] then echo " user requested to continue " ##some commands else echo " User requested to cancel" exit 1 fi exit 0 above code is throwing error, please suggest (HowTos)