Speculative Shell Feature Brainstorming Post: 302509110

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The Lounge What is on Your Mind? Speculative Shell Feature Brainstorming Post 302509110 by tetsujin on Tuesday 29th of March 2011 11:08:25 PM

03-30-2011

Registered User

Quote:

Originally Posted by fpmurphy

Actually no, it is not. It is the direction a number of Unix and GNU/Linux shells have been going for quite a while. Think compound variables in ksh93 and prototypical inheritance in JavaScript for starters.

Admittedly my experience in Korn Shell is rather limited. I don't know everything it's capable of. Compound variables are a new one on me. I had been using mksh for most of my Korn shell experimentation, but I guess I've got to stick with ksh 93 if I want the compound vars...

From what I can tell, though, compound vars aren't "objects", rather they're "structures". "objects" would have methods and (most relevant to the whole file descriptor thing) destructors.

I had never heard of Javascript being used as a shell. The only "Javascript shells" I've seen are in-browser debugging tools. (Quite helpful! But not shells for the Unix environment.) Are you talking strictly about it being used to interact with Javascript code that's running, or interactively to run other programs on the system as well?

Quote:

You do not appear to have done a survey of the internals of modern Unix/Linux shells. I would recommend that you closely examine the internals of such shells and not just the Bash shell which is rather archaic (sorry Chet!) in many respects.

Suggestions, then? What modern Unix/Linux shell should I have looked at that I (probably) haven't?

tetsujin

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LEARN ABOUT CENTOS

chsh

CHSH(1) 							   User Commands							   CHSH(1)

NAME

       chsh - change your login shell

SYNOPSIS

       chsh [-s shell] [-l] [-u] [-v] [username]

DESCRIPTION

       chsh is used to change your login shell.  If a shell is not given on the command line, chsh prompts for one.

       chsh is used to change local entries only. Use ypchsh, lchsh or any other implementation for non-local entries.

OPTIONS

       -s, --shell shell
	      Specify your login shell.

       -l, --list-shells
	      Print the list of shells listed in /etc/shells and exit.

       -u, --help
	      Print a usage message and exit.

       -v, --version
	      Print version information and exit.

VALID SHELLS

       chsh  will  accept  the full pathname of any executable file on the system.  However, it will issue a warning if the shell is not listed in
       the /etc/shells file.  On the other hand, it can also be configured such that it will only accept shells listed in this	file,  unless  you
       are root.

EXIT STATUS

       Returns 0 if operation was successful, 1 if operation failed or command syntax was not valid.

SEE ALSO

       login(1), passwd(5), shells(5)

AUTHOR

       Salvatore Valente <svalente@mit.edu>

AVAILABILITY

       The chsh command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							     July 2009								   CHSH(1)