ServerBuddies Support Blog

How do I enable error logging for PHP scripts which helps in debugging application?

PHP errors are by default logged to the web server’s error log file (at least they are with the default setup on most Linux distros) but it is also possible to instead log PHP errors to a file of your choice. This is useful on production websites so you can periodically check for errors and fix them in a location other than the default webserver error log file.

If you do not currently have a php.ini, make one and place it in the same folder(s) as the PHP script(s) that you want to track errors for. You will need to add the following 2 lines:

If we choose to enable error logging, then we MUST check the error_log often and take corrective actions for persistent errors, it’s recommend having it disabled for security reasons.

Debugging on part(s) of the bash script

Using the set Bash built-in you can run in normal mode those portions of the script of
which you are sure they are without fault, and display debugging information only for troublesome zones.

Say we are not sure what the `uptime` command will do in a script, then we could enclose it in the script like this:

Debugging on part(s) of the bash script

Using the set Bash built-in you can run in normal mode those portions of the script of which you are sure they are without fault, and display debugging information only for troublesome zones. Say we are not sure what the w command will do in the example commented-script1.sh, then we could enclose it in the script like this.

You can switch debugging mode on and off as many times as you want within the same script.

The OpenSSH SSH client supports SSH protocols 1 and 2. Protocol 2 is the default, with ssh falling back to protocol 1 if it detects protocol 2 is unsupported. These settings may be altered using the Protocol option in ssh_config(5)

-v Verbose mode. Causes ssh to print debugging messages about its progress. This is helpful in debugging connection, authentication, and configuration problems.

Multiple -v options increase the verbosity. The maximum is 3.

Example: