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Which shell can I use on Linux?

 
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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
 
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LEARN ABOUT BSD

suspend

suspend(1)							   User Commands							suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10							    15 Apr 1994 							suspend(1)