how to make permanent changes to environment variables?

cgchayan · 09-29-2009, 09:26 PM

Hi,
Is there a way to change the values of some environment variables permanently? Or may be I write a shell script that changes the value of an environment variable and it automatically runs at the start of each new session?

Thanks

smeezekitty · 09-29-2009, 09:28 PM

i was wondering the same thing except i am to busy writing a kernel

manwithaplan · 09-29-2009, 09:36 PM

You can always use your ~/.bashrc. Which environment variables are you referring? I have several global variables declared in my ~/.bashrc

Something like this in my ~/.bashrc
e.g.

Code:

# Global FLAGS
export CHOST="x86_64-pc-linux-gnu"
export CFLAGS="-mtune=core2 -march=core2 -O2 -pipe -mfpmath=sse -ftree-vectorize -mmmx -msse -msse2 -msse3 -mssse3 \
              -ftracer -ftree-loop-distribution -floop-block -floop-interchange -floop-strip-mine -fgraphite \
              -findirect-inlining -ftree-switch-conversion"
export CXXFLAGS="${CFLAGS}" 
export LDFLAGS="-Wl,-O1 -Wl,--as-needed"
export MAKEOPTS="-j3"

bgeddy · 09-29-2009, 11:45 PM

This is from the bash man page :

Quote:

When bash is invoked as an interactive login shell, or as a non-interactive shell with the --login option, it first reads and executes com-
mands from the file /etc/profile, if that file exists. After reading that file, it looks for ~/.bash_profile, ~/.bash_login, and ~/.pro-
file, in that order, and reads and executes commands from the first one that exists and is readable. The --noprofile option may be used
when the shell is started to inhibit this behavior.

rob.rice · 09-30-2009, 01:47 AM

you can also set them system wide in /etc/profile you should make a back up of this file BEFORE YOU EDIT IT

cgchayan · 09-30-2009, 04:49 AM

Thanks.. I got it

carbonfiber · 09-30-2009, 04:58 AM

Quote:

Originally Posted by smeezekitty

i was wondering the same thing except i am to busy writing a kernel

Science H. Logic...

smeezekitty · 09-30-2009, 12:26 PM

Quote:

Originally Posted by carbonfiber

Science H. Logic...

WTF does that mean?

carbonfiber · 09-30-2009, 02:57 PM

Not a fan of South Park, I guess? I don't blame you, who has time to watch South Park when they're busy writing a kernel.