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Old 11-16-2010, 07:35 AM   #1
lt7
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Differences between shells ?


What are the differences between the shells in Linux (eg. bash,bourne,korn,C etc) and which one is it better to run scripts under?
 
Old 11-16-2010, 07:38 AM   #2
GrapefruiTgirl
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Hello, welcome to LQ!

http://en.wikipedia.org/wiki/Compari...command_shells

Above link probably should be high on your reading list.

As for "which is better", there is no single absolutely correct answer. Different systems (OS's) have different shells, many have multiple shells on them; some are more common than others, and some are definitely more rare.

If you have a more specific question, by all means, ask it.
 
Old 11-16-2010, 09:06 AM   #3
onebuck
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Hi,

I would add that the choice of shell can be a personal preference and application development for tasks. You can write a script to perform required or desired repeated tasks.


Bash (Unix shell)
, a Unix command shell written for the GNU project seems to be the default for most users.
Quote:
excerpt from Bash (Unix shell);Bash is a POSIX shell with a number of extensions. It is the shell for the GNU operating systemUnix-like operating systems. It is the default shell on most systems built on top of the Linux kernel as well as on Mac OS X and Darwin. It has also been ported to Microsoft Windows using Subsystem for UNIX-based Applications (SUA), or POSIX emulation provided by Cygwin and MSYS. It has been ported to MS-DOS by the DJGPP project and to Novell NetWare.
The Bash command syntax is a superset of the Bourne shell command syntax. The vast majority of Bourne shell scripts can be executed by Bash without modification, with the exception of Bourne shell scripts stumbling into fringe syntax behavior interpreted differently in Bash or attempting to run a system command matching a newer bash builtin, etc. Bash command syntax includes ideas drawn from the Korn shell (ksh) and the C shell (csh) such as command line editing, command history ...
Bash Reference Manual is a great manual to have on hand.

The
Bash Beginners Guide will provide some useful information.

Advanced Bash-Scripting Guide 6.1
is revised and this document is both a tutorial and a reference on shell scripting with Bash by Mendel Cooper.

The above links and others can be found at 'Slackware-Links'. More than just Slackware® links!
 
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Old 11-16-2010, 09:47 AM   #4
i92guboj
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There's enough info on the net. "Better" is on the eye of the beholder, of course. The only thing I can say for sure is that if you need supreme portability then you probably should stick to the Bourne Shell (sh). Bash is a very good compromise between portability and features.

There's a lot of alternatives that offer good feature sets (ksh), or just an alternate syntax (csh variants).

A good place to start is the wikipedia.
 
Old 11-16-2010, 09:35 PM   #5
chrism01
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You may wish to read this http://www.faqs.org/faqs/unix-faq/shell/csh-whynot/
In general, bash is the default on Linux, whilst ksh tends to be the default on commercial *nix eg Solaris.
These are both 'modern' shells ie have a lot of built-in funcionality.
This is for non-root users; root shell tends to be called 'sh', which can actually be the old Bourne shell or the POSIX shell.
Bash is highly compatible with ksh; just watch out for differences in gnu versions of utilites eg 'find'.
I highly recommend specifying the full shell path+name at the start of every shell script file to avoid nasty surprises. You cannot assume that even the same named shell will be stored in the same path on different *nixes.
In some instances (eg read the startup rules for logging in in different circumstances) a shell may be symlinked to another shell....
YHBW
 
  


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