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Shell Programming and Scripting

cd command not executing in if else loop

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# 1  
Old 01-20-2011
cd command not executing in if else loop
Hi,

I am executing below script

Code:
s1=`pwd`
s2=/space
if [ $s1 == $s2 ]
then
echo "done"
else
echo "mistake"
cd /tmp
fi

I am not able to migrate to /tmp directory if the condition is not true.However mistake is being printed.Means cd command is not working here.All other commands except cd are working.
Please help
# 2  
Old 01-20-2011
It is working inside your script, but as soon as the script is finished, the sub shell in which the script runs closes and you are back to the parent shell and there the working directory remains unchanged.

It would change if you called the script like this:
Code:
. /path/to/script

But this is not usually done from an interactive shell.
# 3  
Old 01-20-2011
cd command might well work, but once you quit your script you will find yourself in the directory you were in when executing the script...
Try to add after echo mistake:
Code:
cd /tmp
pwd
read keyb
fi

it will display where you are after cd /tmp, and wait you type a char on the keyboard to exit...
# 4  
Old 01-20-2011
Script becomes own environment
When you execute a script, it is its own entity. A script execution creates its own space to do what it needs to do, and when done, returns keyboard control to you. So 'cd' commands and other commands have no effect on you once the script is done executing.
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