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UGU: Unix Guru Universe - Unix Tip #4473- June 10, 2025
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Unix Tip #4473- June 10, 2025
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@PHL.Boeing.com
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.
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4471
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4470
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4469
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4468
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