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My current shell is bash and I want to convert to ksh. I tried to convert through chsh or ypchsh but dont have permission to convert. So I tried to convert using .bash_profile as below

$vi .bash_profile
ksh
. ./.profile .

On reopening the putty, .bash_profile runs which changes to ksh, but the alias in .profile are not getting resolved.

  • No i dont have permission to edit the /etc/passwd – Yuva Raj May 20 at 8:12
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please check following answer and use login SHELL

ksh --login

https://stackoverflow.com/questions/29072913/how-to-manually-start-interactive-ksh-and-have-it-execute-home-profile-on-sta

  • it worked,thanks for your solution – Yuva Raj May 20 at 14:09
  • Most Welcome :) – Gurdyal May 20 at 16:35
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Obviously in your example .profile won't be sourced until you exit ksh. That's the way shell works.

I tried to do on my local machine the following:

$ cat /home/test/.profile
exec ksh

$ cat ~/.kshrc
echo "commands you need in ksh"

As profile is read only once on a login, it seems to be working. Whenever I login as a user, I've ksh as a shell. Didn't check it with tmux or screen though.

$ ps
  PID TTY          TIME CMD
 9667 pts/1    00:00:00 ksh
 9675 pts/1    00:00:00 ps

Note, that I use exec ksh over simple invoke ksh, so you'll have just ksh which replaced bash instead of ksh running as a child of bash.

In any way, I advise to ask sysadmin or whoever has the grant to update the settings in /etc/passwd to do so. It might help you to avoid unexpected issues with inheritance of some settings from bash you might not face when you directly invoke ksh.

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