How to use Shell scripts break and continue commands
This article introduces the knowledge of "how to use Shell scripts break and continue commands". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!
During a loop, it is sometimes necessary to force a jump out of the loop when the end condition of the loop is not reached, and Shell uses two commands to do this: break and continue.
Break command
The break command allows you to jump out of all loops (terminating execution of all subsequent loops).
In the following example, the script enters an endless loop until the user enters a number greater than 5. To jump out of this loop and return to the shell prompt, you need to use the break command.
The code is as follows:
#! / bin/bash
While:
Do
Echo-n "Input a number between 1 to 5:"
Read aNum
Case $aNum in
1 | 2 | 3 | 4 | 5) echo "Your number is $aNum!"
*) echo "You do not select a number between 1 to 5, game is over!"
Break
Esac
Done
Continue
The continue command is similar to the break command, except that it does not jump out of all loops, just out of the current loop.
Modify the above example:
The code is as follows:
#! / bin/bash
While:
Do
Echo-n "Input a number between 1 to 5:"
Read aNum
Case $aNum in
1 | 2 | 3 | 4 | 5) echo "Your number is $aNum!"
*) echo "You do not select a number between 1 to 5!"
Continue
Echo "Game is over!"
Esac
Done
The running code finds that when you enter a number greater than 5, the loop in this example does not end, the statement
The code is as follows:
Echo "Game is over!"
Will never be executed.
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