Sponsored Content
Top Forums Shell Programming and Scripting What are the differences between 'bash' and 'sh' Post 35824 by deckard on Thursday 8th of May 2003 01:35:00 PM
Old 05-08-2003
What are the differences between 'bash' and 'sh'

Hopefully this doesn't come off as too much of a "newbie" question or a flamebait. But I have recently begun working with a Sun Solaris box after having spent the past five years working with RedHat. From what i can tell, thing look fairly similar and the 'man' command is some help. But I've noticed that the default shell is 'sh' and I tend to be more familiar with 'bash' since that's the default in RedHat. I understand that the reason that 'sh' is the defatul for root is that it's statically compiled and available even if the /usr partition is unavailable. But there are features that I like that seem to be missing:
-Arrow up for command history
-Arrays or creating arrays like this: test1=( `ls` )
-Emacs style editing on the command line
Just to name a few. So my question is, how different is 'sh' from 'bash'. I imagine there are things I will have to rewrite in my bash scripts to get them to work under 'sh'. But how much work am I really in for? Are there any good resources online that will lay out the differences or good books that anyone would recommend? I love the O'Reilly book on Bash. Anything similar for 'sh'? Thanks
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How to subtract 2 hours from 'date' in shell ( /bin/sh ) script ?

I write a sh script that zip and copy to tape all files that older then 2 hours. 1. The way I choose is - touch a file with "now - 2 hours", then use fine with '! -newer' 2. Do you have any other idea to do it ? tnx. (1 Reply)
Discussion started by: yairon
1 Replies

2. Programming

i can't use 'make' in my computer?

I need to compile a file,but 'make' does not work.please tell me how to use it or need which tools? (3 Replies)
Discussion started by: dsun5
3 Replies

3. Shell Programming and Scripting

Clearify what it means under 'WHAT' when hit the 'w'-command

I wonder how I shall read the result below, especially 'what' shown below. The result was shown when I entered 'w'. E.g what is TOP? What is gosh ( what does selmgr mean?)? login@ idle JCPU PCPU what 6:15am 7:04 39 39 TOP 6:34am 6:45 45 45 TOP 6:41am ... (1 Reply)
Discussion started by: Aelgen
1 Replies

4. UNIX for Advanced & Expert Users

Terminal 'Local Echo' lost on Modem Dial-out

Can anybody help me? I am developing a utility for automating message paging to a BT alphanumeric pager. I am using a USR 56K Fax-modem connected to /dev/cuab on a Sun Ultra-10. I am using the UNIX 'tip' utility to connect to the modem and I have configured the modem as follows: Baud Rate:... (2 Replies)
Discussion started by: mybeat
2 Replies

5. Filesystems, Disks and Memory

HELP! The '/var/adm/message' file increase every few seconds???

Hi, guys, I have a big problem. I've got a sun solaris 4.1.4 workstation, and the /var/adm/message file will add one row every few seconds. It soon becomes a large file. I wander if there are some mistakes configuring the workstation. the /var/adm/message is as follow: ... (1 Reply)
Discussion started by: cloudsmell
1 Replies

6. UNIX for Dummies Questions & Answers

HELP! The '/var/adm/message' file increase every few seconds???

Hi, guys, I have a big problem. I've got a sun solaris 4.1.4 workstation, and the /var/adm/message file will add one row every few seconds. It becomes a large file in a short time. I wander if there are some mistakes configuring the workstation. the /var/adm/message is as follow: ... (3 Replies)
Discussion started by: cloudsmell
3 Replies

7. UNIX for Dummies Questions & Answers

quoting echo 'it's friday'

echo 'it's friday' why appear the > (3 Replies)
Discussion started by: yls177
3 Replies

8. IP Networking

BELKIN 'F5D5020' 16bit PCMCIA - FreeBSD HOWTO

Hey all, I've bought a few bits from Belkin who seem quite happy to support FreeBSD! Last time I bought a UPS from them and it's still going well :D I saw this on their website that the 16bit PCMCIA card was supported under FreeBSD: http://www.belkin.com/network/F5D5020.html I went to my... (0 Replies)
Discussion started by: WIntellect
0 Replies

9. Email Antispam Techniques and Email Filtering

Procmail recipe: blocking 'unsubscribe and opt-out' messages....

Here is a crude procmail recipe that I quickly created (NOT a procmail recipe expert, btw) that has been catching lots of spam (current second after the charset_spam recipe posted earlier): :0B * .*If.you.do.not.wish.to.receive...* more_spam :0B * You.requested.to.receive.this.mailing... (0 Replies)
Discussion started by: Neo
0 Replies

10. UNIX for Advanced & Expert Users

How to remove a file with a leading dash '-' in it's name?

Somehow someone created a file named '-ov' in the root directory. Given the name, the how was probably the result of some cpio command they bozo'ed. I've tried a number of different ways to get rid of it using * and ? wildcards, '\' escape patterns etc.. They all fail with " illegal option --... (3 Replies)
Discussion started by: GSalisbury
3 Replies
SYSLOGOUT(8)						      System Manager's Manual						      SYSLOGOUT(8)

NAME
syslogout - modular centralized shell logout mechanism DESCRIPTION
syslogout is a generic approach to enable centralized shell logout actions for all users of a given system in a modular and centralized way mostly aimed at avoiding work for lazy sysadmins. It has only been tested to work with the bash shell. It basically consists of the small /etc/syslogout shell script which invokes other small shell scripts having a .bash suffix which are con- tained in the /etc/syslogout.d/ directory. The system administrator can drop in any script he wants without any naming convention other than that the scripts need to have a .bash suffix to enable automagic sourcing by the /etc/syslogout script. For shell sessions, the contents of /etc/syslogout.d/" will be sourced by every user at logout if the following lines are present in his $HOME/.bash_logout: if [ -f /etc/syslogout ]; then . /etc/syslogout fi If used for X sessions it is advisable to include the former statement into the Xreset script of the X display manager instead to prevent that closing of an terminal emulator window yields unexpected results in your running X session if your X11 terminal emulator is using a login shell. Be sure then to run it under the user-id of the X session's user. See the example files in /usr/share/doc/syslogout/ for illustration. Users not wanting /etc/syslogout to be sourced for their environment can easily disable it's automatic mechanism. It can be disabled by simply creating an empty file called $HOME/.nosyslogout in the user's home directory using e.g. the touch(1) command. Any single configuration file in /etc/syslogout.d/ can simply be overridden by any user by creating a private $HOME/.syslogout.d/ directory which may contain a user's own version of any configuration file to be sourced instead of the system default. It's names have just to match exactly the system's default /etc/syslogout.d/ configuration files. Empty versions of these files contained in the $HOME/.syslo- gout.d/ directory automatically disable sourcing of the system wide version. Naturally, users can add and include their own private scripts to be automagically executed by /etc/syslogout at logout time. OPTIONS
There are no options other than those dictated by shell conventions. Anything is defined within the configuration scripts themselves. SEE ALSO
The README files and configuration examples contained in /usr/share/doc/syslogout/ and the manual page for bash(1), xdm(1x), xdm.options(5), and wdm(1x). Recommended further reading is everything related with shell programming. If you need a similar mechanism for executing code at login time check out the related package sysprofile(8) which is a very close compan- ion to syslogout. BUGS
syslogout in its current form is mainly restricted to bash(1) syntax. In fact it is actually a rather embarrassing quick and dirty hack than anything else - but it works. It serves the practical need to enable a centralized bash configuration until something better becomes available. Your constructive criticism in making this into something better" is very welcome. Before i forget to mention it: we take patches... ;-) AUTHOR
syslogout was developed by Paul Seelig <pseelig@debian.org> specifically for the Debian GNU/Linux system. Feel free to port it to and use it anywhere else under the conditions of either the GNU public license or the BSD license or both. Better yet, please help to make it into something more worthwhile than it currently is. SYSLOGOUT(8)
All times are GMT -4. The time now is 02:57 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy