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bash: expanding a variable with embedded quotes

Posted on 2014-04-09
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Last Modified: 2014-04-09
Hi,

I've been wrestling with this for too long, and need help.

I have the following bash shell function to issue a cURL command:

mycurlfunc () {
	CMD=GET
	HDRS=
	BODY=
	if [ "$1" = PUT ]; then
		CMD=PUT 
		HDRS='-H '"'"'Content-Type: application/json'"'"
		BODY='-d '"'"$2"'"
	fi
	curl --compressed -k -v -X $CMD $HDRS $BODY [<url>]
}

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Here's what I want to happen.  I want to invoke mycurlfunc with (something like) the following:

mycurlfunc PUT '{"token": "foo"}'

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such that $1 = 'PUT' and $2 = '{"token": "foo"}'.  I want the HDRS and BODY variables to be expanded/inserted into the curl command so it is issued as follows:

curl --compressed -k -v -X PUT -H 'Content-Type: application/json' -d '{"token": "foo"}' [<url>]

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When I create HDRS and BODY at the command line they look like the strings I want:

$ set -vx
$ HDRS='-H '"'"'Content-Type: application/json'"'"
$ echo $HDRS
echo $HDRS
+ echo -H ''\''Content-Type:' 'application/json'\'''
-H 'Content-Type: application/json'
$ BODY='-d '"'"'{"token": "foo"}'"'"
$ echo $BODY
echo $BODY
+ echo -d ''\''{"token":' '"foo"}'\'''
-d '{"token": "foo"}'

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However, when I put them into the curl command, the literal variable values, not "evaluated" values, appear; i.e., the single quotes themselves are being escaped and the string tokens in the variables are being quoted:

curl --compressed -k -v -X PUT -H ''\''Content-Type:' 'application/json'\''' -d ''\''{"token":' '"foo"}'\''' [<url>]

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My question is simple: How can I set HDRS and BODY up to expand the way I want?

Max points since I'm trying to get this done quickly - I think I'm reasonably close, but just can't find the right combination.  Thanks for any help!
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Question by:TruthHunter
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2 Comments
 
LVL 68

Accepted Solution

by:
woolmilkporc earned 500 total points
ID: 39989330
Try in line 10:

eval curl --compressed -k -v -X $CMD $HDRS $BODY [<url>]
0
 

Author Comment

by:TruthHunter
ID: 39989441
Aha!  That was it!  I'm usually so "eval-averse" that it hadn't crossed my mind to try that.  Once you mentioned it, it was obvious.

So thanks very much, and enjoy the points!  :^)
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