command " cd .. " not working in bash script?

Kilam orez · 03-12-2010, 01:37 AM

Hi dear linux users.

i wonder why the cd ./.. or cd ./../ or
cd .. command does not work, when used in bash script.

But it works fine, when used on the command line.

can i anybody tell me, why is it so? sorry if my question is silly.

With Regards,
kilam

Galib · 03-12-2010, 01:44 AM

EDIT: Mis-Read your question.

evo2 · 03-12-2010, 01:52 AM

What do you mean "does not work?". What happens? Is there an error?

Can you make the script output pwd before and after tring to cd?

Cheers,

Evo2.

Kilam orez · 03-12-2010, 03:42 AM

Quote:

Originally Posted by evo2

What do you mean "does not work?". What happens? Is there an error?

Can you make the script output pwd before and after tring to cd?

Cheers,

Evo2.

hi,

my script(fc_mov_2.sh) is:----

#!/bin/bash

cd ./../

#----end---------

when i run it, i get:---

hg@hg:~/Desktop/is64/trial> ./fc_mov_2.sh
hg@hg:~/Desktop/is64/trial> pwd
/home/hg/Desktop/is64/trial

No error is shown. i wonder, what is happening?

regards,
kilam

evo2 · 03-12-2010, 03:48 AM

The script is a separate process. To illustrate (as I suggeted in my first post), use the following script:

Code:

#!/bin/bash
pwd
cd ..
pwd

The script can't change the working dir of the shell that calls it. If you really want to do something like that you need to source the script. First, remove the "#!/bin/bash" from the first line and then do

Code:

. fc_mov_2.sh

Cheers,

Evo2.

catkin · 03-12-2010, 03:58 AM

Quote:

Originally Posted by evo2

First, remove the "#!/bin/bash" from the first line

Wouldn't do any harm but not necessary.

evo2 · 03-12-2010, 04:30 AM

Quote:

Originally Posted by catkin

Wouldn't do any harm but not necessary.

Good point. I guess it's just a convention I use so that when I look at a script I immediately know whether it should be sourced or executed.

Cheers,

Evo2.

Kilam orez · 03-12-2010, 05:14 AM

Quote:

Originally Posted by evo2

The script is a separate process. To illustrate (as I suggeted in my first post), use the following script:

Code:

#!/bin/bash
pwd
cd ..
pwd

The script can't change the working dir of the shell that calls it. If you really want to do something like that you need to source the script. First, remove the "#!/bin/bash" from the first line and then do

Code:

. fc_mov_2.sh

Cheers,

Evo2.

Thank you Evo2, it worked !!!!