Bourne Shell,” .sh” was developed by Stephen Bourne in 1977. Most of the unix system V still keep the Bourne Shell in their system such as in HP-UX:
$ uname -a;ll /bin/sh
HP-UX Node B.11.31 U ia64 1371064322 unlimited-user license
-r-xr-xr-x 2 bin bin 683144 Dec 8 2017 /bin/sh
Meanwhile the Korn Shell or ksh was initially released on 1983 under AT&T licenses and was developed by David Korn. The ksh was the default shell for HP-UX and known faster in processing the loop syntax compared to Bash shell. Besides, the most common used now in unix-like operating system is Bash shell or Bourne Again Shell which developed by Brian Fox in 1989 and licensed under GNU. Why Bourne-Again? this is because of the some of features were copied over from Bourne/.sh shell such as “history” commands.
There are a lot of shell type used by the users nowadays, but only a few was the famous ones including ksh, sh, and bash. The issue happens when the commands is not working but it does in the bash shell. For example, the recall run previous commands by using up and down arrows in bash shell that do not work on ksh shell. But, we may use “Escape” keys twice on ksh shell to do the same features even though it has less comfort because of the changing of the pointer to the one character backwards every time the “Escape” keys entered on the first time.
To cater this issues, we may use the bash shell on the unix operating system by installing it altogether with their dependencies. There were three of them that required by bash package before it can be working as fine as in linux operating system. Below is the dependencies:
1)gettext – used to change the language (such as locale in numbers)
2)libiconv – is a conversion library for both kinds of applications in unix OS and bash shell
3)termcap – to provides terminal types for many screen sizes. (for example vt100 in HP-UX support a full 24 lines of text in 132 column mode)
1) Install bash package and its dependencies
swinstall -s <depot server>:/<path of package> bash
swinstall -s <depot server>:/<path of package>gettext
swinstall -s <depot server>:/<path of package> libiconv
swinstall -s <depot server>:/<path of package> termcap
2) Verify the installed package
Node:home/user# swlist|grep -iE ‘bash|gett|libico|termc’
bash 4.3.028 bash
gettext 0.18.1.1 gettext
libiconv 1.14 libiconv
termcap 1.3.1 termcap
3) Linking the path of bash to the default path in HP-UX
ln -s /usr/local/bin/bash /bin/bash
Node:home/user# ll /bin/bash
lrwxr-xr-x 1 root sys 19 Aug 8 07:10 /bin/bash -> /usr/local/bin/bash
4) Verify the bash installation
$ echo $SHELL
$ sudo bash
Last successful login: Tue Aug 6 04:59:43 UTC 2019
1) ksh shell on unix seems to have more faster processing compared to bash shell especially in loop syntax but bash having more faster in tab completion.
2) bash shell having more features as it more newer than ksh shell and mlocate utility in bash seems to works faster compared to find utility because it process through the database but only sync once a day in cron.daily.
3) Recalling previous run commands through up and down arrows looks more convenient for sysadmin because it will smooth-en the administrative task that normally require faster commands in business critical systems.
https://en.wikipedia.org/wiki/UNIX_System_V, Aug 2019
https://en.wikipedia.org/wiki/Bash_(Unix_shell), July 2019
https://en.wikipedia.org/wiki/Bourne_shell, December 2018
https://www.gnu.org/software/termutils/manual/termcap-1.3/html_mono/termcap.html, November 1998
https://www.gnu.org/software/libiconv/, May 2019
https://www.cyberciti.biz/faq/ksh-for-loop/, Aug 2009
https://www.cyberciti.biz/faq/bash-for-loop/, Dec 2018
https://en.wikipedia.org/wiki/KornShell, July 2019
https://en.wikipedia.org/wiki/VT100, May 2019