So, back in the day i.e. earlier today, this is how I'd log into IBM Cloud: -
ic login --apikey $(cat ~/keyfile_staging_payg.json | jq -r .apikey) -r us-south -a
where I'm using cat and jq to parse a JSON document containing my API key: -
cat ~/keyfile_staging_payg.json | jq -r .apikey
Well, today I learned that I can do it in fewer keystrokes ...
ic login --apikey @keyfile_staging_payg.json -r us-south -a https://test.cloud.ibm.com
In other words, I'm using @ rather than a combination of cat and jq.
Now, personally, I use aliases to make life even easier e.g.
testlogin='ic login --apikey @~/keyfile_staging_payg.json -c 19f41865a1cf430c918334d89f6b09b9 -r us-south -a https://test.cloud.ibm.com'
where said aliases are defined in ~/.bash_profile or ~/.zshenv.
All of which is nice!