Shell Programming and Scripting

Hi all,I installed cent OS in my machine. Now when i open the terminal and start writing some commands, then by default with which shell i am working with?

Will i be able to change the shell and then run a few commands? if possible then how to change the shell?

Please reply

Thank you

By typing the corresponding command for Shell,
for ex: for bash it is
#bash and yr shell will be changed.

So you want to say that #csh will change the current shell to c shell,correct?

What is the system command to check in which shell i am working at present?

echo $SHELL
will print current shell.

ok First i did this:

#ksh

then i did this:

echo $SHELL

The output i get is this:

/bin/bash

why not the output is /bin/ksh then?

---------- Post updated at 04:05 AM ---------- Previous update was at 03:57 AM ----------

every time i write this:

echo $SHELL

the output is /bin/bash

after #ksh, if i do this: echo $SHELL

then also the output is /bin/bash

So?????getting confused

if you want to change your shell just edit bash to ksh in the /etc/passwd file end of the your username file.for example your username is oracle

Code:

 
vi /etc/passwd
oracle:x:250:302:Oracle User:/export/home/oracle:/bin/bash

change bash with ksh and save the file

1) Don't edit /etc/passwd directly unless you really know what you are doing. If you do have to do it in an emergency, use "vipw" and definitely not "vi".

To change a default shell for a user just use the "usermod" command.

2) If you log in with one shell and want to change to another shell which is installed on your computer, just type the path to that shell:
e.g.
/usr/bin/ksh

(i.e. Don't type a # character).

If the shell does not change it can be because some Linux machines link all likely shell names to "bash".