What is whence in Linux? Description. whence tells how the shell would interpret each name if used as a command name. Shell keywords, aliases, functions, built-in commands, and executable files are distinguished. For executable files, the full path name is given. If the executable file is a tracked alias, the string identifies it as cached.
What does && means in Linux? Think of && as specifying “run the first command and, only if it succeeds, run the second command”. The && operator is most often used in scripts when you need to ensure that some file exists or some other condition is met before you take the next step.
What is backslash in Linux command? In Unix systems, and even some programming languages like C, the role of the backslash is to indicate to the system that the next character has a special meaning. Therefore, it works as an escape character. For example, a lowercase n, when used with a backslash, n, indicates a new line character.
What is $() in Linux? Again, $() is a command substitution which means that it “reassigns the output of a command or even multiple commands; it literally plugs the command output into another context” (Source).