Question

I am working on a existing build script where the script file contains these (Some part )
As part of the build process , i need to run this script file .

#!/bin/sh

if  [ -z $1 ];  then
    help
elif [ $1 == 'test' ]; then 
test

Could anybody please let me know what does this mean and form where does the value will be fed from ??

Answer 1

Actually this script says:

1. If the script is called without arguments, then call function help
2. Else if the first argument passed to the script is CheckIn then call function CheckIn

An example could be:

#!/bin/sh

CheckIn() {
 echo "CheckIn called!!";
}

help () {
 echo "Help called!!";
}


if  [ -z $1 ];  then
   help
elif [ $1 == 'CheckIn' ]; then
   CheckIn
fi

So if this script is named, i.e test.sh the output of running it would be:

sh test.sh
output: Help called!!

sh test.sh CheckIn
output: CheckIn called!!

Finally please note that in your logged-in user shell there can be built in scripts named help and CheckIn. In this case these scripts/commands will be called and there is no need for functions named help/CheckIn to be present.