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Top Forums Shell Programming and Scripting use of '$?' in unix shell script Post 302318148 by little_wonder on Thursday 21st of May 2009 12:28:35 AM
Old 05-21-2009
MySQL use of '$?' in unix shell script

Hi All,

Please explain me the use of '$?' in unix.

I've tried the below code.

#! /bin/sh

echo '$#' $#
echo '$@' $@
echo '$?' $?

when i pass the arguments 1 2 3

i got the below o/p

$# 3
$@ 1 2 3
$? 0

here, what does $? means. if possible please exp me some other possibilities with command line arguments.

Thanks in advance for all of your precious answers.
 

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echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME
echo, noecho - enable/disable terminal echo SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib -R /usr/xpg4/lib -lcurses [ library... ] c89 [ flag... ] file... -lcurses [ library... ] #include <curses.h> int echo(void); int noecho(void); DESCRIPTION
The echo() function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially, curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control soft- ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined. RETURN VALUES
Upon successful completion, these functions return OK. Otherwise, they return ERR. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5) SunOS 5.11 5 Jun 2002 echo(3XCURSES)
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