[olug] Unix Tip: BOURNE SHELL PSEUDO HASH TABLES

[Unix Guru Universe]

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			      UNIX GURU UNIVERSE 
			         UNIX HOT TIP

			Unix Tip 2025 - July 18, 2003

		    http://www.ugu.com/sui/ugu/show?tip.today

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BOURNE SHELL PSEUDO HASH TABLES

The best way to explain this 
is with an example:

You may want to write a simple 
script that launches an xterm 
window with different color 
options.  Pseudo hash tables in 
bourne shell.

$ xwindow MidnightBlue

An easy way to this is by first 
listing the supported colors in 
the script (pseudo hash table):

DarkSlateGrey="#2f4f4f"
DimGrey="#696969"
MidnightBlue="#191970"
NavyBlue="#000080"

Next, simply grab the hex color 
code by using the following 
command:

BGColor=`eval echo $"$(echo $1)"`

"$(echo $1)" evaluates to "MidnightBlue" and
`eval echo $MidnightBlue evaluates to "#191970".

Simply launch the xterm window 
using $BGColor as the background 
color:  

xterm -bg="$BGColor" &

This method for extracting pseudo hash 
values may be used for NIS map files, 
file date stamps, GUI colors, etc.


This tip generously supported by: Jasper.Silvis at PHL.Boeing.com




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