Insert bcrypt hash into specific line in file using bash - bash

Question

I need to update an application configuration by inserting bcrypt hash into file config.yml at specific lines.
echo -e "$Enter password for user1"
read -p ": " user1_pass
echo -e "$Enter password for user2"
read -p ": " user2_pass
user1_hash=$(htpasswd -bnBC 10 "" $user1_pass | tr -d ':\n')
user2_hash=$(htpasswd -bnBC 10 "" $user2_pass | tr -d ':\n')
$user1_hash should be placed inline 2 and $user2_hash inline 7.
config.yml
user1:
hash: "$2y$12$shEKzuVfogdZFbbraSqhwOOh96hfxe1NzLQbpmHJvgDUeRfRrkf3a"
reserved: "true"
roles: "user"
user2:
hash: "$2y$12$Fkc5GAp9Za5caIfHjBgNQ.jNEss0SJfCLTlm9EhAcjzPVy.kLriBa"
reserved: "true"
roles: "user"
What is the best approach to do that using bash?

Answer 1

You can edit the file using Ruby :
#!/usr/bin/ruby
require 'yaml'
obj = YAML.load_file('config.yml')
bcrypt_hash='$2y$12$shEKzuVfogdZFbbraSqhwOOh96hfxe1NzLQbpmHJvgDUeRfRrkf3a'
obj['user1']['hash'] = bcrypt_hash
obj['user2']['hash'] = bcrypt_hash
puts YAML.dump(obj)
This will output :
... More yml content
user1:
hash: "$2y$12$shEKzuVfogdZFbbraSqhwOOh96hfxe1NzLQbpmHJvgDUeRfRrkf3a"
user2:
hash: "$2y$12$shEKzuVfogdZFbbraSqhwOOh96hfxe1NzLQbpmHJvgDUeRfRrkf3a"
... More yml content
Hope it helps!

Answer 2

Use the keyword echo to write into the file
echo -e "$Enter password for user1"
read -p ": " user1_pass
echo -e "$Enter password for user2"
read -p ": " user2_pass
user1_hash=$(htpasswd -bnBC 10 "" $user1_pass | tr -d ':\n')
user2_hash=$(htpasswd -bnBC 10 "" $user2_pass | tr -d ':\n')
echo "user1:" > config.yml
echo " hash: " + $user1_hash >> config.yml
echo "user2:" >> config.yml
echo " hash: " + $user2_hash >> config.yml
the contents of config.yml file being
user1:
hash: + $2y$10$7S0fC4wTqAfm9ytJ5BquC.3KITsqLoqPXHyj3mzgXdvw10TRIybni
user2:
hash: + $2y$10$jcYMrOsdIzwR3AlSONNfCuc.B5AoGVV4i31KSsx0PLlpn17issJfe