Is there a way that I can permanently enable a SCL?

I've installed rh-php56, and I would like to make sure that it is loaded every time I ssh into my machine.

I am currently running CentOS 7.

3 Answers 3


using scl enable actually opens a new shell inside your current one, which is quite unclean, especially if done from a login script.

You should place, instead, in your ~/.bash_profile:

source /opt/rh/rh-nginx18/enable


source scl_source enable rh-nginx18

The latter is more "elegant" as it is independent from the actual installation path.

This has the effect of loading the environment in your current shell.

  • this also works on amazon linux Linux ip-10-1-129-214 4.14.238-125.422.amzn1.x86_64 #1 SMP Tue Jul 20 20:51:46 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
    – retgoat
    Feb 23 at 5:45

Redhat proposes placing a file in /etc/profile.d, i.e. for python:

$ cat /etc/profile.d/enablepython33.sh
source scl_source enable python33

As this works for the devtools under centos for me you could try this.

  • 3
    This is what I do. I've created an /etc/profile.d/scl_enable.sh file with all of my scl files in that one file. Sep 26, 2018 at 13:31

I think you could add a line into your shell profile (e.g. ~/.bash_profile) to enable your scl of choice. For example,

scl enable rh-nginx18 bash

EDIT: marked as spoiler since this is dangerous

Reload your profile or logout/login, and you should have access to your SCLs.

  • 7
    One problem with this is that your resulting bash is no longer a login shell. And you can't make it a login shell. If you try, you'll fork bomb your system. This may work in some circumstances, but it's not the recommended method. Jan 10, 2018 at 2:59
  • 4
    CAREFUL! Adding an scl command like the above just got me a "frozen" login because the script got stuck for some reason. Have this page for a handy reference for when you get locked out: serverfault.com/questions/94503/…
    – Lance Kind
    Aug 22, 2019 at 21:33
  • 1
    The accepted response is DANGEROUS, and should be somehow demoted or removed. Adding this so maybe people will notice it before forkbombing themselves :)
    – Dan Vatca
    Dec 4, 2019 at 8:14
  • This fork bombed me and should be instantly removed. Dec 2, 2020 at 22:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.