shell script text processing

Question

I am working on a shell script to capture all instances names (only) in an az. I am using aws-cli to fetch the list. When i fire the command via script i get the list which is long, i have shortened for it as this is just example. I receive below response to my query.

[ [ "host_abc" ], [ "host_xyz" ], [ "host_foo" ], [ "host_bar" ] ]

I just want capture the host names only and get rid of all other special characters like those square brackets, commas and double quotes. I want to get output as copied below.

host_abc
host_xyz
host_foo
host_bar

Is there a way to filter such response stored in variable or a file in a shell script? Thank you

Q: Is there a way to filter such response stored in variable or a file in a shell script? A: If you're in a Linux shell, then your best bet is to learn a little sed: digitalocean.com/community/tutorials/…. Otherwise, for other shells (including Windows PowerShell), learn some basic regex: javatpoint.com/regex — paulsm4
– paulsm4, Commented Sep 5, 2022 at 21:13
if your data is in json format, it is best to use a json library, rather then trying to treat it as ascii strings and slice it up with sed/aqk. it will serve you well. unfortunetly, unix shell does not have built in json scripting, but there is a tool call jq. also, it is easy to create a small python script to properly read that data. — toppk
– toppk, Commented Sep 5, 2022 at 21:23

wkz · Accepted Answer · 2022-09-05 21:22:06Z

2

If your system has jq, it is really helpful for things like this:

aws-cli <whatever> | jq -r 'flatten | join("\n")'

answered Sep 5, 2022 at 21:22

wkz

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