environment variables?

hari_mj23 · #1 20th March 2006, 07:47 AM

hi,
when i type "env", the terminal displays the env variables which are being set. I would like to where I can modify these variables. will it b stored in some file?

moreover, when i use "getenv("TTY")" in a c program, i am not getting any value and it shows null. how to correct this?

thanks for help

hari

bytesniper · #2 20th March 2006, 08:24 AM

to modify an environment variable you would either

1) on the command line type export <variable>=value

or, if you have several environment commands in a script you can

2) type source /path/filename

joseph

InKo · #3 20th March 2006, 08:25 AM

you can set the environment variables with
$ export MYCARIBABLE=....

I wrote a little test program and it works for me well with getenv...

is the variable defined what you are getenv'ing? is the name correctly used in c program?

well, it is all what I know.

mikeshinoda11 · #4 30th March 2006, 02:24 AM

Hi everyone..

I want to install Seadas software on my fedora 5..I download the tar.gz file from ftp samoa direct to /root/seadas4.9..i follow installation instruction until the come to this step I get stuck..

Set the SEADAS environment variable, where "PATH_TO_SEADAS" is
the full directory path to seadas (this is the path I want to set /home/rpm2006/seadas4.9):

-If you are running under csh or tcsh:
> setenv SEADAS PATH_TO_SEADAS
-If you are running under bash:
> export SEADAS=PATH_TO_SEADAS

can someone explain more on how to do this step pls..

giulix · #5 30th March 2006, 07:29 AM

To find out whether you're running bash or tcsh, type this at the console:

Code:

echo $SHELL

If you're running bash, put this at the end of your $HOME/.bashrc file:

Code:

export SEADAS=/home/rpm2006/seadas4.9

And then type '. $HOME/.bashrc' at the console
If you're running tcsh, put this at the end of your $HOME/.cshrc file:

Code:

setenv SEADAS /home/rpm2006/seadas4.9

And then type 'source $HOME/.cshrc' at the console

mikeshinoda11 · #6 31st March 2006, 03:23 AM

iguilix..I try to do this the whole day but it still not working..so if you dont mind can u assist me..

[QUOTE=giulix]To find out whether you're running bash or tcsh, type this at the console:

Code:

echo $SHELL

I m done with this step and the result is

[root@localhost ~]# echo $SHELL
/bin/bash
[root@localhost ~]#

then what should I do..

giulix · #7 31st March 2006, 06:19 AM

Open a terminal and type:

Code:

echo "export SEADAS=/home/rpm2006/seadas4.9" >> $HOME/.bashrc
. $HOME/.bashrc

And that should be it...

mikeshinoda11 · #8 31st March 2006, 06:45 AM

this is what I got..

[root@localhost seadas4.9]# echo "export SEADAS=/home/rpm2006/seadas4.9" >> $HOME/.bashrc
[root@localhost seadas4.9]# . $HOME/.bashrc
-bash: /root/seadas4.9/config/seadas.env: No such file or directory
[root@localhost seadas4.9]#

did u have any idea why "-bash: /root/seadas4.9/config/seadas.env: No such file or directory" appear..

giulix · #9 31st March 2006, 07:53 AM

I can only guess... apparently, no matter where you install it, seadas expects its installation directory to be /root/seadas4.9 or, more probably, $HOME/seadas4.9.

mikeshinoda11 · #10 3rd April 2006, 07:03 AM

hmm..mby I try to do it all over again and I will let you know if I having the same error..

anyway thanks a lot giulix..