A few simple commands to check free disk space and find the largest folder

How to quickly view all cron jobs for all users on the server in one list

Test scripts for all occasions

Fix for SSH key connection error ’no matching host key type found. Their offer: ssh-dss,ssh-rsa'

Brief instruction on how to fix the error Invalid command ‘AuthGroupFile’, perhaps misspelled or defined by a module not included in the server configuration Action ‘configtest’ failed.