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Shell Scripting: Get string inside quotations

Posted on 2013-11-08
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Last Modified: 2013-11-08
x=1; \
y=2; \
echo x: $x - '{"y": "$y"}'

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I would expect this result:
x: 1 - {"y": "2"}

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but instead I get this results:
x: 1 - {"y": "$y"}

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Question by:hankknight
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3 Comments
 
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Expert Comment

by:simon3270
ID: 39633450
It's because the double quotes are nested within single quotes.  try:
    echo x: $x - '{"y": '"$y"'}'
(that's a single quote between the space and the double quote before the $y, and one between the double-quote after $y and the curly brace)
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Accepted Solution

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simon3270 earned 2000 total points
ID: 39633465
As you can see quotes are hard!

I meant:
    echo x: $x - '{"y": "'$y'"}'
where the extra quotes are between the double-quote and the $y, and between the $y and its trailing double-quote
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LVL 20

Expert Comment

by:simon3270
ID: 39633469
Essentially, you put single quotes round text that you don't want changed at all, then double quotes (or no quotes at all) round bits where you want variable substitution to take place.
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