LINUX byDreamy postedApr 30, 2015

[Shell Script] 쉘 스크립트 함수에서 return값 반환

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1. echo strings


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lockdir="somedir"
testlock(){
    retval=""
    if mkdir "$lockdir"
    then # directory did not exist, but was created successfully
         echo >&2 "successfully acquired lock: $lockdir"
         retval="true"
    else
         echo >&2 "cannot acquire lock, giving up on $lockdir"
         retval="false"
    fi
    echo "$retval"
}
 
retval=$( testlock )
if [ "$retval" == "true" ]
then
     echo "directory not created"
else
     echo "directory already created"
fi


2. return exit status

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lockdir="somedir"
testlock(){
    if mkdir "$lockdir"
    then # directory did not exist, but was created successfully
         echo >&2 "successfully acquired lock: $lockdir"
         retval=0
    else
         echo >&2 "cannot acquire lock, giving up on $lockdir"
         retval=1
    fi
    return "$retval"
}
 
testlock
retval=$?
if [ "$retval" == 0 ]
then
     echo "directory not created"
else
     echo "directory already created"
fi



3. share variable

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lockdir="somedir"
retval=-1
testlock(){
    if mkdir "$lockdir"
    then # directory did not exist, but was created successfully
         echo >&2 "successfully acquired lock: $lockdir"
         retval=0
    else
         echo >&2 "cannot acquire lock, giving up on $lockdir"
         retval=1
    fi
}
 
testlock
if [ "$retval" == 0 ]
then
     echo "directory not created"
else
     echo "directory already created"
fi





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