Bash JSON: Add Var

Question

I'm trying to use curl command to perform a POST request. The format of the content is the message I am POSTing is JSON. In the example below, I don’t get how to add the $* part, which should be all parameters you add when you start the .sh file.

curl -X POST --data-urlencode 'payload={"channel": "#serverstatus", "username": "BananaStatus", "text": "${*}", "icon_emoji": ":banana:"}' https://hooks.slack.com/services/

When I run that, I just receive the ${*} as text.

sligor · Accepted Answer · 2015-08-27 21:48:22Z

2

bash don't expand variables between ' ' (single quotes)

you have to use double quote (" ")

try:

'...any text..'"${*}"'...other text..'

it gives whith your example:

curl -X POST --data-urlencode 'payload={"channel": "#serverstatus", "username": "BananaStatus", "text": "'"${*}"'", "icon_emoji": ":banana:"}' https://hooks.slack.com/services/

answered Aug 27, 2015 at 21:48

sligor

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Lucas Piske · Accepted Answer · 2015-08-27 21:51:38Z

1

When using variables in the middle of strings you should use double quotes.

So, use:

"payload={\"channel\": \"#serverstatus\", \"username\": \"BananaStatus\", \"text\": \"${*}\", \"icon_emoji\": \":banana:\"}"

Instead of:

'payload={"channel": "#serverstatus", "username": "BananaStatus", "text": "${*}", "icon_emoji": ":banana:"}'

answered Aug 27, 2015 at 21:51

Lucas Piske

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