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Full Discussion: Extracting value of a variable
Top Forums Shell Programming and Scripting Extracting value of a variable Post 302955514 by wisecracker on Friday 18th of September 2015 04:35:12 AM
Old 09-18-2015
As an addendum an example of multiple variables...
OSX 10.7.5, default terminal using 'sh'...
Code:
#!/bin/sh
# Value_extractor.sh Variable[?]
echo 'echo "Sourcing..."' > /tmp/FileA
echo 'Variable1="This is a string...";' >> /tmp/FileA
echo 'Variable2="My_name_is_Bazza..."' >> /tmp/FileA
echo 'Variable3="1234567890"' >> /tmp/FileA
echo 'echo "Sourcing done!"' >> /tmp/FileA
. /tmp/FileA
# eval echo '$'"$1" > /tmp/someval
# Retrieved_value=$( cat /tmp/someval )
Retrieved_value=$( eval echo '$'"$1" )
echo $Retrieved_value

Results:-
Code:
Last login: Fri Sep 18 09:18:02 on ttys000
AMIGA:barrywalker~> cd Desktop/Code/Shell
AMIGA:barrywalker~/Desktop/Code/Shell> ./Value_extractor.sh Variable1
Sourcing...
Sourcing done!
This is a string...
AMIGA:barrywalker~/Desktop/Code/Shell> ./Value_extractor.sh Variable2
Sourcing...
Sourcing done!
My_name_is_Bazza...
AMIGA:barrywalker~/Desktop/Code/Shell> ./Value_extractor.sh Variable3
Sourcing...
Sourcing done!
1234567890
AMIGA:barrywalker~/Desktop/Code/Shell> _

 

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LEARN ABOUT OPENSOLARIS

echo

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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