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Which shell can I use on Linux?

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Top Forums Shell Programming and Scripting Which shell can I use on Linux?
# 1  
Old 06-27-2017
Which shell can I use on Linux?
I have Linux x86_64 x86_64 x86_64 GNU/Linux
I thought that Linux can use only bash shell
however, when I wrote the code:

Code:
 #!/bin/sh
 NAME=`basename $0 .sh`
Today=`date '+%Y%m%d'`
TIMESTAMP=`date +%H:%M:%S`
LOCAL_SERVER=`hostname`
 let countcla=0
 countcla=`expr ${countcla} + 1`
 echo "${NAME} ${Today} ${TIMESTAMP} ${LOCAL_SERVER} ${countcla}"
exit

the result was
Code:
 test 20170627 16:15:48 gbdted01.us.db.com 1

Does it means I can use any shell, not ONLY BASH? Does it mean that I don't have to convert my old shell scripts to bash?

Thanks for contribution
# 2  
Old 06-27-2017
bash is many linux distributions' standard (or preinstalled) shell, but almost any comes with a sh (which, in turn, may be still another, e.g. dash, in disguise, or even a link to bash mimicing sh). And, any shell can be installed by the user. Look into your distribution's package manager.
# 3  
Old 06-27-2017
Where can I find distribution's package manager
# 4  
Old 06-27-2017
That depends on the distribution you use (and which you failed to mention, btw); there are quite some. Ubuntu / Debian have synaptic, Fedora use yum, and RedHat have their RPM.
# 5  
Old 06-27-2017
I am not admin. I am just trying to understand, if I need to convert sh /ksh to bash or not

---------- Post updated at 04:56 PM ---------- Previous update was at 04:52 PM ----------

BTW, I have RedHot
# 6  
Old 06-27-2017
Then ask your admin to install the ksh- rpm.
This User Gave Thanks to RudiC For This Post:
digioleg54
# 7  
Old 06-27-2017
When I test bash command, the script doesn't give an error, it just doesn't print value
Code:
 MYSHELL=$(ps -hp $$|awk '{echo $5}')

print
Code:
 MYSHELL IS

I believe it is ksh
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