02-03-2011
Quote:
Originally Posted by
cfajohnson
IOW, it is limited to bash. Why do that when you can write in a way that works in bash as well as all other POSIX shells?
if you are talking about using let, I personally would not use it, but i don't condone it either if its used appropriately. In this world, not all want to write in POSIX mode. Why? If I am using bash 4 and I want to change case for example, I want to use $^ or $, instead of calling external commands since they are internals and I don't have to use it in other shells... does that answer why?
take note, that we are OT already. My only comment is that "let" is technically correct and legal to be used in OP's context and not a question of writing POSIX or not.
Quote:
Nor does any other form of arithmetic. But the Bourne shell is not a standard Unix shell (it is a precursor to it).
You said the more reliable way is $((m+=1)). I said it does not work in bourne shell. But if you want to talk about POSIX and stuff and if I am still using the bourne shell or tcsh, then it will not work right? In any case, this is also OT
Quote:
There are many shells; that's why the standard is important.
I know why the standard comes about. You did not get my point and I am too lazy to explain my point to you either.
Quote:
I, too, utilize the shell to the fullest. The way I do that is to use the most portable syntax available.
When I need something that is not available in the standard shell, then and only then do I use the more parochial syntax.
so just to get this clear, you do write in a way that is usable in bourne shell, zsh , tcsh , dash, etc, correct?
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LEARN ABOUT SUNOS
getusershell
getusershell(3C) Standard C Library Functions getusershell(3C)
NAME
getusershell, setusershell, endusershell - get legal user shells
SYNOPSIS
#include <unistd.h>
char *getusershell(void);
void setusershell(void);
void endusershell(void);
DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If
/etc/shells does not exist, the following locations of the standard system shells are used in its place:
/bin/bash /bin/csh
/bin/jsh /bin/ksh
/bin/pfcsh /bin/pfksh
/bin/pfsh /bin/sh
/bin/tcsh /bin/zsh
/sbin/jsh /sbin/pfsh
/sbin/sh /usr/bin/bash
/usr/bin/csh /usr/bin/jsh
/usr/bin/ksh /usr/bin/pfcsh
/usr/bin/pfksh /usr/bin/pfsh
/usr/bin/sh /usr/bin/tcsh
/usr/bin/zsh /usr/xpg4/bin/sh
The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.
The setusershell() function rewinds the file or the list.
The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.
RETURN VALUES
The getusershell() function returns a null pointer on EOF.
BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.
SunOS 5.10 30 Aug 2004 getusershell(3C)