How to use exit code as conditional in simple 2 line bash script

Question

url="http://localhost:8080/matlib"
until $(curl "$url" --max-time 10) == 0; do stuck_pid=$(chown_pid); kill -9 $stuck_pid && "killing chmod process";done

what I'm trying to do is curl this address, if it times out after 10 seconds, then term a PID.

The part that is failing is the '== 0', the intention here was to compare the return code from curl with 0, but I'm receiving the following error:

-bash: ==: command not found

anubhava · Accepted Answer · 2017-07-13 21:45:04Z

1

This indeed is the problem:

$(curl "$url" --max-time 10) == 0

== operator must be inside [[ ... ]] or [ ... ] square brackets.

However you are not comparing exit status of curl but output of curl since you are executing $(...) or command substitution.

You should be using just:

until curl "$url" --max-time 10; do ...; done

answered Jul 13, 2017 at 21:45

anubhava

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1 Comment

anubhava Over a year ago

0 means success in shell and when you execute until curl "$url" --max-time 10; do ...; done it only checks for exit code 0.

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