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Shell Programming and Scripting

Extracting value of a variable

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Top Forums Shell Programming and Scripting Extracting value of a variable
# 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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