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Why do we use -i in Linux commands? – CentOS

Why do we use -i in linux commands and what is it’s use?
e.g.
ssh -i .filename.pem [email protected]
(or)
sudo -i
What’s the use of -i here?

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2

Answers


  1. 0

    ssh -i identity_file A file from which the identity key (private key) for public key authentication is read.

    sudo -i -(simulate initial login) option runs the shell specified by the password database entry of the target user as a login shell. This means that login-specific resource files such as .profile or .login will be read by the shell. If a command is specified, it is passed to the shell for execution via the shell’s -c option. If no command is specified, an interactive shell is executed. sudo attempts to change to that user’s home directory before running the shell. The security policy shall initialize the environment to a minimal set of variables, similar to what is present when a user logs in. The Command Environment section in the sudoers(5) manual documents how the -i option affects the environment in which a command is run when the sudoers policy is in use.

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  2. 0

    For different commands, there can be different parameter options and i can be one of them.

    By checking the help you can understand the meaning of each of them. This can be done by

    • man command -> will show the manual page of the command

    or

    • command -h or command --help -> will show the help page

    Try with sudo instead of command, you will understand what I am saying.

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