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Context:

We are running a system which has our Linux & Unix Boxes authenticate against AD and because we have numerous different versions of Unix/Linux, we have to default to /bin/sh to make sure that the logins always work no matter the Server. I am looking to setup a .profile on RHEL to check to see what shell is set to at login and if its not bash, to switch to bash. I am not having any luck google searching for a method to do this and my shell scripting is on the weaker side.

Question:

How does one check for shell and switch at login without the control of the passwd file?

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2 Answers 2

Reset to default
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Untested. Edit your ~/.profile ... 

if [ -x /bin/bash ]; then
  exec bash
fi
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  • This does work, as long as there is no recursion happening because of login scripts but I found out its a moot point because the server has /bin/sh -> /bin/bash
    – thebtm
    May 10, 2016 at 20:29
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    Bash, when invoked as /bin/sh, tries to mimic sh, though. There's a difference in how it will execute scripts. Just saying.
    – tink
    May 10, 2016 at 20:55
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Do you mean something like which bash >/dev/null && exec bash? Or is the output of getent passwd of any use to you?

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