Hi

I know its a dumb question but can any one please explain me the difference of executing a shell script in the following 2 ways.

. script.sh
sh script.sh

I have a problem if I execute the following code as sh script.sh

DB_CNT_ALW=0.20
SCT_VAR=0.05

if [ "$(echo "if (${DB_CNT_ALW} > ${SCT_VAR}) 1" | bc)" -eq 1 ]; then
echo "== Difference is greater"
else
echo "== Difference is not greater"
fi

The above mentioned code was suggested by vgersh99. But the same code works well if I execute the script as . script.sh
I would prefer executing the script as sh script.sh since if I use exit command inside the script it won't come out of unix but instead exit from the script.

Thanks
Shash

". script.sh" will execute the script in the current environment, as if you had typed all the commands in script.sh at the command prompt. Therefore, an "exit" in the script will exit your session. Why not just chmod +x the script and run it by doing: ?

You can't run that script as:
sh script.sh
because sh is an ancient shell that cannot run that code. You need to use
ksh script.sh
bash script.sh
or some other reasonably modern shell.

Thanks Glenn Arndt & Perderabo!!

Both the solutions are working.