Setting environment variables in tcsh

[Muskaan]

Hi all,

Has anyone worked on tcsh ? I wanted to know how one can export environment variables from child to parent. I tried using setenv but the value remains only in the child shell script. It becomes "undefined" when I try to echo its value from the parent terminal session. anyone knows ????

Thanks in advance!
Muskaan

 

[vgersh99]

you can't [in any shell] - child's vars cannot be propagated up to its parent.

Unless you make your 'child' run in the same process as its parent [no pun intended]. For csh-like shells [incliding tcsh] look into 'source'.


vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[Muskaan]

No, what I mean is to be able to export value from a shell script, say set_user_name.sh to the session that ran it, like so;

---snip---
[dhcp80:~/verify_ut] muskaan% echo $SHELL
/bin/tcsh

[dhcp80:~/verify_ut] muskaan% cat set_user_name.sh
#!/bin/tcsh
setenv user_name muskaan
echo user_name is $user_name

[dhcp80:~/verify_ut] muskaan% ./set_user_name.sh
user_name is muskaan

[dhcp80:~/verify_ut] muskaan% echo $user_name
user_name: Undefined variable.
---snip---

So although when I run set_user_name.sh, the value of user_name is properly set as &quot;muskaan&quot;, it is an undefined variable when I try to see the value from the command prompt.

I am trying to determine an equivalent of &quot;export&quot; as in ksh. In which, I can export a variable within a file, and run the file in the same shell, like &quot;. <filename>&quot; (dot space filename). so after the file is run, the varible exported retains a value. Why can't i do this in tcsh ?

Thanks for your time!
Muskaan

 

[vgersh99]

As I said........

source ./set_user_name.sh

vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[Muskaan]

duh, I did not understand that point earlier, thanks tonnes!

 

[AHinMaine]

To further enhance tcsh's usefulness, see:

http://tcshrc.sourceforge.net

--
Andy

http://www.nachoz.com

&quot;Historically speaking, the presence of wheels in Unix has never precluded their reinvention.&quot;
Larry Wall