If you’re getting many “unstrusted issuer” alerts in your app logs, it might be due to some CA trusted certificates outdated.
To fix that, just perform an update:

For Ubuntu/Debian

For CentOS/RedHat

If you need to push multiple lines to one file through a bash script, you can simply use that syntax:

Tip: Be aware that if you’re using indentation, last line should not be indented (this would lead you to some errors).

If you want to add line instead of overwriting file (like we did in the previous example), just replace the “>” with “>>” after cat command.