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csh: Start an interactive shell session without loading startup configs.
$ csh -f
try on your machine

The command "csh -f" is used to run the C-shell (csh) with the "-f" option. Here is an explanation of the individual components:

  1. "csh" - It stands for C-shell, which is a Unix shell command interpreter. It provides an interactive command-line interface to the Unix operating system. C-shell is one of the available shell options along with other popular ones like Bash.

  2. "-f" - It is an option or a flag passed to the csh command. In this case, it stands for "fast" or "force". This option is used to start the shell in a non-interactive mode, also known as a fast startup. It means that csh will not read the user's personalized startup files and will skip any initialization files such as ".cshrc" or ".login". It can be useful when you want to run a script or a batch command without any interference from the user's shell settings.

So, the command "csh -f" starts the C-shell in a non-interactive mode, bypassing any personalized startup files.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.
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