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If the command's program file is not in a directory listed in you PATH environment variable, the shell returns a "commands not found" error.By default, the shell does not look in your current working directory or your home directory for commands This is really a security mechanism so that you don't execute programs by accident.Our Word of the Year choice serves as a symbol of each year’s most meaningful events and lookup trends.It is an opportunity for us to reflect on the language and ideas that represented each year. However, it can be reconfigured to be other characters as well. The file may be changed interactively; the next time hostname completion is attempted bash adds the contents of the new file to the already existing database. It is usually conigured to be the semicolon (;) and newline characters.
Tidbit: On Linux, the $FF variable may also be used like $IFS.When you type a command at the shell prompt, the shell will look for that command's program file in each directory listed in the PATH variable, in order.The first program found matching the command you typed will be run. When this variable is assigned a value, the history file is truncated, if necessary, to contain no more than that number of lines. Contains the name of a file in the same format as /etc/hosts that should be read when the shell needs to complete a hostname. The maximum number of lines contained in the history file.