A simple but urgent query -- I will be very grateful if you advise please. I am writing a script
xyz.ksh. It can be run in two modes:-
1) without any parameters.
2) with a tablename as xyz.ksh -s table_name

I am using

while getopts s:s table_name
do
case $table_name in
s) TABLE_NAME=$$OPTARG;;
done

The problem I am having is if someone is running by mistake "xyz.ksh -s" that is with the parameter but without the value I am being unable to throw an exception.

Please can you advise.

Sujoy Roychowdhury
BI Consultant

Simple IF shold fix that

if [[ $2 != "" ]];then
print $1 $2
else
print Missing an argument, stupid
fi

Another way would be to check the number of command line arguments which should be either 0 or 2 as in the following ksh code snipet:

[[ $# != 0 && $# != 2 ]] && {
echo "invalid syntax"
exit 1
}

[[ $# ==2 && "$1 != "-s" ]] && {
echo "invalid command line argument: $1"
}