String comparison problems

Shell Programming and Scripting
1

Req:

1)I have one shell script a.sh
2)I opened Putty session , with user name = SIR100 , and i ran a.sh script in back ground and
it took 5 minutes to complete.Meanwhile,i ran same script second time i.e a.sh with same user it sholud not allow to run the script , but it's allowing using my below code.But, if i ran the same script , with different user , i.e SIR200 , it should allow to run the script.
3)Final requirement is , One user can't run the script , untill first one has completed.

4)According to below code , when user runs first time , cursor shoud goes to last else block , and script needs to be started.Where in , if same user run second time before completion of first scrit , it should goes to last if condition , and script should get exit.

5)Here , main problem is , how to compare 2nd time if the same user is running the script.

below is the code snippet:

#!/bin/sh

#Below command will print the login user name
oper=`whoami`



#Below command will print , on which user the script a.sh is running.
User=`ps -ef|grep a.sh|grep -v grep|awk '{print $1}'`

echo "Login User " $oper
echo "User Name  " $User

flag=0

listOfUsers=${echo $User | tr " " "\n"}
echo "List of Users " $listOfUsers

for userName in $listOfUsers
do
    echo $userName  
    if [ "${userName}" = "${oper}" ]
    then
    echo "Inside if aaaaaaa"
        flag=1
        exit 1
    fi
done


echo "flag value  " $flag 

if [ $flag -eq 1 ]
 then
 echo "Inside if bbbbbbbbb"
        echo "script is in progress..."
	
        exit 1
 else
        echo "Script is not running it initiated now."
	sleep 40
 fi
2

Try this:

listOfUsers=$(echo $User | tr " " "\n")

Guru.

3

I tried the same, still im facing the same problem

4

Then go with the lock file concept ..

Add the below lines as the first and last line of your a.sh script.

touch $(whoami).lockfile ## to create a lock file for that particular user
rm $(whoami).lockfile ## add this in last line of a.sh

Create a file b.sh then have the below lines in it.

if [ -f $(whoami).lockfile ]
then
   echo "Lock file exists for $(whoami). Script is running ..." ; exit
else
   echo "Lock file not exists for $(whoami). Initiating new script .."
   sh a.sh
fi

Hope this helps :slight_smile: