command to grep the variable from file

Shell Programming and Scripting
1

Hi,

I am looking for the following:

  1. A command to 'grep' the variable from a file
  2. And check whether the entered variable is empty in that file

I have a file as given below:

IAGLOBAL_USERID=admin

I want to check with a whether the variable contains a value, say here its admin if it contains value I will proceed ahead else I should give three tries for the user if in those three tries if the user does not enter the userid then I will exit.

I did the following:

var1=`cat $NCO/response_uid.txt | grep -i IAGLOBAL_WASUserID | cut -d'=' -f1`
var2=$(echo "${var1}" | sed -e 's/^ *//g;s/ *$//g')
echo $var2
if [ -z "$var2" ];
then
rm -rf $NCO/response_uid.txt
rm -rf $NCO/response_def.txt
exit 1;
fi

Any ideas?

Thanks,
Dinesh

2

Why IAGLOBAL_WASUserID?

3

To grep the variable, you can do :

var=`awk -F'=' '/IAGLOBAL_USERID/{sub(/[ \t]+$/, ""); print $2}' $NCO/response_uid.txt`