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This command will search in all /home/*/public_html directories (also in subdirectories) for error_log files:

find /home/*/public_html -type f -name error_log -exec du -sh {} \;

Usage example:

root@web [~]# find /home/*/public_html -type f -name error_log -exec du -sh {} \;
4.0K    /home/tolomike/public_html/error_log
4.0K    /home/tolomike/public_html/wp-includes/ID3/error_log
9.0K    /home/tolomike/public_html/wp-includes/theme-compat/error_log
4.0K    /home/tolomike/public_html/wp-includes/SimplePie/error_log
4.0K    /home/tolomike/public_html/wp-includes/SimplePie/Cache/error_log
root@web [~]# 

Many times you will want to see the error+log files that use the most space. For this, sort the results. The command is:

find /home/*/public_html -type f -name error_log -exec du -sh {} \; | sort -n

You need to list only the error_log files bigger than 50MB? Use this command:

find /home/*/public_html -type f -name error_log -size +50000k -exec du -sh {} \;

Now let’s see how we delete these files.
To delete all the founded error_log files, use:

find /home/*/public_html -type f -iname error_log -delete

To delete error_log files larger than 50MB, use:

find /home/*/public_html -type f -iname error_log -size +50000k -delete

Want to add a cron job that will delete error_log files? Use the crontab -e command to edit the server jobs.

crontab -e

Then add the line (the cron job will run every day at 02:30):

30 2 * * * find /home/*/public_html -type f -name error_log -delete

Exit the crontab editor by CTRL+X. Confirm the changes.