Writing functions in the shell

2. Execute the "nano function.sh" command to create a new shell script file with the name "function.sh".

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4. Edit the newly created shell script file "function.sh". The function must be defined before use.

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5. The contents of the shell script are as follows:

   #!/bin/bash

   Add () {

   sum_1=$1;

   sum_2=$2;

   sum= ' expr $sum _1 + $sum _2 ';

   echo "The sum is ${sum}";

   }

   
   

   Add $ A

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7. Assign executable permissions to the newly created function.sh command "chmod 755 function.sh".

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9. Use "./function.sh 1 2" to invoke the script and pass two numbers to the script.

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11. The result of executing the command is "the sum is 3".

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13. 
    

Writing functions in the shell