In the case of Bash – the most popular shell for Linux, auto code completion isn’t available by default. Bash can run most of the “sh” scripts without any modification. Code auto-completion is a great feature for reducing your load of typing each and every single command as you type. If you’re interested in the code completion, then Fish shell is the best choice.

Despite default code completion, you can still enjoy the feature, thanks to the great “bash-completion”. This tool will enable the auto-completion feature on Bash shell.

Let’s enjoy “bash-completion” shell right away!

Getting “bash-completion”

The “bash-completion” provides all the available pre-built packages for the major Linux distros. Check bash-completion on GitHub.

The following guide will install “bash-completion” from source and it will apply for all the Linux distros.

Grab “bash-completion” –

git clone https://github.com/scop/bash-completion.git

cd bash-completion/

Build the tool –

autoreconf -i

./configure

make

make check

At this stage, you may find out some dependency issue. For passing this stage, “pytest” >= 3.6, pexpect, tcllib and dejagnu.

Install “bash-completion” –

sudo make install

Using “bash-completion”

It’s actually a bash script by itself. Check out the code of “bash-completion” –

bat /etc/profile.d/bash_completion.sh

After the installation is complete, it’s time to enjoy auto code completion. Fire up a terminal –

sudo apt i[TAB]

cat /etc/re[TAB]

You can also set your simple bash completion code. The method follows the following structure –

complete -W ‘<autocompletion_codes>’ <command_name>

Let’s see with an example.

complete -W ‘google.com osradar.com’ host

In the above command, there will be 2 different autocomplete suggestions for “host” (google.com and osradar.com).

Type “host” command –

host [TAB]

host google.com

host osradar.com

Enjoy!

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Today, let’s grab and enjoy the C Shell – the shell using the C++ syntax instead of the popular and familiar “bash” syntax. It’s an old shell. However, the shell gets much love from the Unix community, especially the programmers.

For enjoying C Shell, you have to get the Tcsh – a modified version of the original C Shell with new features and enhancements.

Let’s get C Shell right away!

Installing C Shell (Tcsh)

C Shell is a very cool shell and a nice alternative to the default Bash shell. However, almost all the Linux distros don’t set C Shell by default. You have to install it and set it as the default shell manually.

Run the following command(s) according to your own Linux distro –

• Ubuntu

sudo apt install tcsh

• Debian

sudo apt-get install tcsh

• Fedora

sudo dnf install tcsh

• OpenSUSE

sudo zypper install tcsh

• Arch Linux

sudo pacman -S tcsh

• Other Linux distros

If your system wasn’t listed above, you have to manually find out the package for your system. The package should be named as “tsch” or “c shell”. Tcsh has been around for quite a long time, so your chance of finding out C Shell is pretty high.

Listing all the shells

Before we switch to the new C Shell, we have to know the location of the shell(s). Run the following command –

cat /etc/shells/

In most cases, you’ll get more than one available shells in your system. Run the following command for the “tcsh” only.

cat /etc/shells | grep tcsh

It’s time to shift towards Tcsh.

chsh

Now, when asked about “Login shell”, enter “/bin/tcsh” (without quotes).

Voila! C Shell is your default shell now!

Reverting back to Bash

Not interested in C Shell anymore? Run the following command for reverting back to Bash –

chsh

Enter the value –

/bin/bash

Voila! Bash is back!

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