How to use in curl command data from file? - bash

Question

I have a text file containing variables of fqdn and hostname. File looks like this
first_fqnd first_hostname
second_fqdn second_hostname
..... .....
I have to update some data using curl in a bash script, but I have to take fqdn and hostname from this text file and make a curl for every pair fqdn and hostname.
My curl should be like this:
curl -H "Content-Type:application/json" -XPUT "https://pup.pnet.pl/api/hosts/**fqdn from file**" -d '{"host":{"name": "**hostname from file**"}}' --cacert bundle.pem --cert xxx-pem.cer --key xxx-privkey.pem
How can I pass these variables from file to curl? I've thought about using awk, but I don't know how to use it in curl command

Answer 1

Use a while construct to read the lines of file and put whitespace separated parameters as two relevant variables, fqdn and hostn:
while read fqdn hostn; do
curl -H .... -XPUT "https://pup.pnet.pl/api/hosts/${fqdn}" \
-d '{"host":{"name": "'"${hostn}"'"}}' --cacert ....; done <file.txt

Answer 2

Try something like this:
#!/bin/bash
while read fqdn hostname; do
curl -H "Content-Type:application/json" -XPUT \
"https://pup.pnet.pl/api/hosts/${fqdn}" \
-d '{"host":{"name": "'${hostname}'}}' --cacert bundle.pem \
--cert xxx-pem.cer --key xxx-privkey.pem
done <input_file.txt
The while read fqdn hostname will take input from Standard Input, line by line, splitting it by Bash's Internal Field Separator into "column" variables $fqdn and $hostname. See Catching User Input for more information.