Extracting value of a variable


 
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# 15  
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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TABS(1) 						    BSD General Commands Manual 						   TABS(1)

NAME
tabs -- set terminal tabs SYNOPSIS
tabs [-n | -a | -a2 | -c | -c2 | -c3 | -f | -p | -s | -u] [+m[n]] [-T type] tabs [-T type] [+[n]] n1[,n2,...] DESCRIPTION
The tabs utility displays a series of characters that clear the hardware terminal tab settings then initialises tab stops at specified posi- tions, and optionally adjusts the margin. In the first synopsis form, the tab stops set depend on the command line options used, and may be one of the predefined formats or at regular intervals. In the second synopsis form, tab stops are set at positions n1, n2, etc. If a position is preceded by a '+', it is relative to the previous position set. No more than 20 positions may be specified. If no tab stops are specified, the ``standard'' UNIX tab width of 8 is used. The options are as follows: -n Set a tab stop every n columns. If n is 0, the tab stops are cleared but no new ones are set. -a Assembler format (columns 1, 10, 16, 36, 72). -a2 Assembler format (columns 1, 10, 16, 40, 72). -c COBOL normal format (columns 1, 8, 12, 16, 20, 55) -c2 COBOL compact format (columns 1, 6, 10, 14, 49) -c3 COBOL compact format (columns 1, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62, 67). -f FORTRAN format (columns 1, 7, 11, 15, 19, 23). -p PL/1 format (columns 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61). -s SNOBOL format (columns 1, 10, 55). -u Assembler format (columns 1, 12, 20, 44). +m[n], +[n] Set an n character left margin, or 10 if n is omitted. -T type Output escape sequence for the terminal type type. ENVIRONMENT
The LANG, LC_ALL, LC_CTYPE and TERM environment variables affect the execution of tabs as described in environ(7). The -T option overrides the setting of the TERM environment variable. If neither TERM nor the -T option are present, tabs will fail. EXIT STATUS
The tabs utility exits 0 on success, and >0 if an error occurs. SEE ALSO
expand(1), stty(1), tput(1), unexpand(1), termcap(5) STANDARDS
The tabs utility conforms to IEEE Std 1003.1-2001 (``POSIX.1''). HISTORY
A tabs utility appeared in PWB UNIX. This implementation was introduced in FreeBSD 5.0. BUGS
The current termcap(5) database does not define the 'ML' (set left soft margin) capability for any terminals. BSD
May 20, 2002 BSD