How to append text to a system file via terminal with sudo command

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How to use tee command to append a file
How to use tee command to append a file

Working with Unix-based systems, I have gradually become sluggish to open an editor and tweak something in a file. Especially, system files must only be allowed by a superuser to open which causes a bit complicated and bored. If you are not familiar with Unix-based systems, you probably have some trouble with changing such files.

As the post title suggests, here is the tip.

echo '192.168.1.254 router' |  sudo tee -a /etc/hosts

 

Below is the output of running man tee


NAME
tee -- pipe fitting

SYNOPSIS
tee [-ai] [file ...]

DESCRIPTION
The tee utility copies standard input to standard output, making a copy in zero or more files. The output is
unbuffered.

The following options are available:

-a Append the output to the files rather than overwriting them.

-i Ignore the SIGINT signal.

The following operands are available:

file A pathname of an output file.

The tee utility takes the default action for all signals, except in the event of the -i option.

The tee utility exits 0 on success, and >0 if an error occurs.

STANDARDS
The tee function is expected to be POSIX IEEE Std 1003.2 (``POSIX.2'') compatible.

Running this command is recommended to take more extra care because it will destroy everything saved and persisted on the target files if you forget to indicate the option -a meaning append. I used to be suffered such an incident without having any recoverable way.

Hopefully, this tip helps you improve your productivity on a daily basis.

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