In the example above, ls returned a 0 exit code ... will still return a 0 exit code. Your Linux system includes two curious commands: true and false. Each of these does nothing, except for return ...

This detailed guide explains how to compare files and directories in Linux using the diff command with practical examples.

For example, the m4 preprocessor is wildly complex, vastly underused, and can handle C source code or anything else you care to send to it. If you’ve only used modern C compilers, you may wonder ...