Meaning of tilde expansion in Linux

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WriteBash - This article we will learn about the tilde expansion in Linux. There will be many times, you will encounter many examples using tilde in Linux commands.

So what is tilde expansion?

Tilde expansion

There will be times when you see commands like this.

# cd ~

Or like this.

# source ~/.bashrc

Have you ever wondered what that tilde is? What does it mean in the Linux command?

That extended tilde has a special meaning in Linux. In Linux commands, if it starts with a tilde, it has an extended meaning for the user’s home directory.

Going back to some examples, the simplest one is to try echo.

danie@linuxmint ~ $ echo ~

Here, my user is danie and my home directory is /home/danie. So, when I type echo ~ it will print my home directory.

What if the user does not have a name? This can be seen when switching from a normal user to a user root in Linux Mint.

The tilde will expand to the current user’s home directory, here is my normal user.

meaning-of-tilde-expansion-in-linux Meaning of tilde expansion in Linux
Tilde expansion in Linux.

You see in the image above, I have switched to user root. When echo ~ it prints the home directory of the current user (ie the user I use to login to the computer).


The article was quite clear example of tilde expansion. It is not difficult but if you do not understand its meaning, sometimes you will not understand commands from others’ instructions.

Continue reading the series«« Previous part: Example about pathname expansion in Linux
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