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Full Discussion: [SHELL: /bin/sh] For loop using variable variable names
Top Forums Shell Programming and Scripting [SHELL: /bin/sh] For loop using variable variable names Post 302651899 by Vryali on Wednesday 6th of June 2012 10:24:56 AM
Old 06-06-2012
[SOLVED] [SHELL: /bin/sh] For loop using variable variable names
Simple enough problem I think, I just can't seem to get it right.

The below doesn't work as intended, it's just a function defined in a much larger script:
Code:
CheckValues() {
    for field in \
        Group_ID \
        Group_Title \
        Rule_ID \
        Rule_Severity \
        Rule_Version \
        Rule_Title \
        Rule_Fix_Text; do
        if [ ! -n \$${field} ]; then
            echo "Error, ${field} undefined."
        else
            echo "\$${field}"
        fi
    done
}

The else statement won't exist once I've successfully tested it. The output I see when I run the actual script is:

Code:
# ./GEN000290-1.sh
$Group_ID
$Group_Title
$Rule_ID
$Rule_Severity
$Rule_Version
$Rule_Title
$Rule_Fix_Text
GEN000290-1: Running CMD: grep -c '^games' /etc/passwd
0
Not a finding.
GEN000290-1: Not a finding.

What I expect to see in the above is the value of those variables (Which is just a string of text assuming non-zero length).

Code:
Group_ID='V-4269-1'
Group_Title='Unnecessary Accounts, Games.'
Rule_ID='SV-4269-lr4_rule'
Rule_Severity='CAT II'
Rule_Version='GEN000290-1'
Rule_Title='The system must not have the unnecessary "games" account.'
Rule_Fix_Text='Remove the "games" account from the /etc/password file before connecting a system to the network.'

Kindly note that I need it to be /bin/sh compliant, as it'll be going across multiple Linux/Unix platforms.
Last edited by Vryali; 06-06-2012 at 11:47 AM.. Reason: Clarity
 

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LEARN ABOUT PLAN9

games

GAMES(1)						      General Commands Manual							  GAMES(1)

NAME

       4s, 5s, ana, mandel, plumb, smiley, life, fsim, clock, catclock, fireworks, swar, festoon - time wasters

SYNOPSIS

       games/4s
       games/5s
       games/ana [ fixwords ]
       games/mandel
       games/plumb [ level ]
       games/smiley
       games/life startfile
       games/fsim
       games/clock
       games/catclock [ -c ]
       games/fireworks
       games/swar
       games/festoon [ -p ] [ -e ] [ -t ] [ -sseed ] [ len ] [ pfn ]

DESCRIPTION

       There are a few games in /bin/games:

       4s, 5s	  Try  to  fill  complete rows using 4-square or 5-square tiles.  Move tiles left or right by moving the mouse.  Rotate tiles with
		  buttons 1 and 3.  Drop tiles for more points with button 2 or the space bar.

       ana	  Find anagrams for words typed on standard input.  Anagrams can contain several dictionary words.  The fixwords argument or  num-
		  bers typed on standard input fix the number of words in the output anagrams.

       mandel	  Compute and display Mandelbrot sets.	Menus on the mouse buttons control various things.

       plumb	  Build  a  plumbing  system.  Keep ahead of the advancing oil and don't waste pipe. The level argument lets you start at a harder
		  level.

       smiley	  A game of historical importance.  Type space to shoot, comma to move left, and period to go right.

       life	  Play the game of life, given an initial position.  There is a library of interesting initial positions; the library is consulted
		  if startfile cannot be found.

       fsim	  Pretend you're flying a Cessna.

       clock, catclock
		  Display analog clocks.  Option -c makes catclock crosseyed.

       fireworks  Hoist the fiery blue peter.

       swar	  Space  war  for two players called MCI and SPRINT.  One player types a or d to turn left or right, s to shoot, x to enter hyper-
		  space, and w to accelerate.  The other player uses ;, l, .  and o.  AT&T scores whenever either ship shoots itself or  otherwise
		  causes mayhem.  Hyperspace is occasionally fatal.

       festoon	  Traditional  radical	monoarchate qualitativeness. Now produces pictures (-p), tables (-t), and equations (-e).  The seed can be
		  set to recreate a specific document.	Len is sentence length, and pfn is percent faked nouns (default 0).

FILES

       /sys/games/lib/4scores
	      scores of 4s games

       /sys/games/lib/5scores
	      scores of 5s games

       /sys/games/lib/plumb/scores
	      scores of plumb games

       /sys/games/lib/anawords
	      used by ana

       /sys/games/lib/plumb/*
	      miscellaneous files used by plumb

       /sys/games/lib/life/*
	      interesting starting positions

SOURCE

       /sys/src/games

																	  GAMES(1)
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