This post describe how to find out whether the user name is exist in your system using shell script.

You may get an error, Please Set CMAKE_CXX_COMPILER to a Valid Compiler Path or Name Linux when you compile using cmake command.

You may get an error No ssl_certificate in NGINX even anything in the access logs when attempting HTTPS on browser,

You may get an error, unpack could not create JAR file while installing JDK package in your system,

This post is simple and helpful for how to compare multiple strings by shell scripting. For example can check the country name which one is available.

Normally our server disk space will be increase at the same time we are not monitoring periodically, so create a shell script and send alert to you.

Mysqlcheck command is helpful to repair table and retrieve data when its corrupted also maintenance tables: check optimizes and analyzes.