Using bash - How can I put substring inside a parameter from a file

Question

I have a file called result which looks like this:

{"id":10722,"type":"BRANCH","value":"refs/heads/master","branch":{"id":"refs/heads/master","displayId":"master","latestChangeset":"d53ae5dbaa5e4b2f7b007e94ee91ae2de7e600b6","isDefault":true}}

Using bash, How can I put the substring after "id:" (in this example 10722) inside a parameter? (e.g param=10722)

I need to keep in mind that this file is changing all the time so counting characters is not something I would want to use.

agree...problem is I can't rely on the fact that jq will be installed because it is a remote server that I have no control over it. — Shahar Hamuzim Rajuan
– Shahar Hamuzim Rajuan, Commented Nov 22, 2017 at 13:54

anubhava · Accepted Answer · 2017-11-22 13:56:14Z

1

This looks like JSON data. Better to use jq like this:

jq '.id' file.json
10722

If jq is unavailable then use gnu grep:

grep -oP '"id":\K\d+' file.json
10722

answered Nov 22, 2017 at 13:56

anubhava

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anubhava Over a year ago

\K directive resets all matched information and \d+ matches 1 or more digits.

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