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Full Discussion: how to use regular expression in Bash Shell Scripting
Top Forums Shell Programming and Scripting how to use regular expression in Bash Shell Scripting Post 302175064 by vino on Thursday 13th of March 2008 01:12:34 AM
Old 03-13-2008
Quote:
Originally Posted by sunitachoudhury
Hi Vino

Actually i wrote the following code, given by you.

Input is
a=package1
echo $2 | grep "^b"
echo $2
echo "$2"
if [[ $2 -eq 0 ]] ;
#if grep "^p" $a
then
echo "true"
else
echo "false"
fi

and the output of this is coming as


true
bye jim

here two spaces are coming in the $2 variable.
There was a typo in my earlier post. It should read $a instead of $2.
$? stands for the exit code of a command that was issued. For grep, the exit code is 0 if a successful pattern was matched. Else 1 will be returned.
 

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LEARN ABOUT SUNOS

noecho

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 5.10							    5 Jun 2002							    echo(3XCURSES)
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