Fish – A Smart and User-Friendly Interactive Shell for Linux

The Fish (Friendly Interactive Shell) is an innovative command-line shell for Linux and Unix-like systems. Unlike traditional shells that disable features by default to save resources, Fish enables powerful features out of the box to enhance user productivity.

Key Features of Fish Shell

• User-friendly and interactive interface
• Smart autosuggestions based on command history
• Web-based configuration interface
• Syntax highlighting with 256 terminal colors
• X clipboard integration
• Built-in error checking and validation
• Comprehensive help system
• Arrow key navigation for suggestions

Installing Fish Shell

Step 1: Install Python Software Properties

First, install the required dependencies ?

$ sudo apt-get install python-software-properties

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  python-pycurl
Suggested packages:
  libcurl4-gnutls-dev python-pycurl-dbg
The following NEW packages will be installed:
python-pycurl python-software-properties
0 upgraded, 2 newly installed, 0 to remove and 7 not upgraded.
Need to get 67.5 kB of archives.
After this operation, 358 kB of additional disk space will be used.
Do you want to continue? [Y/n] y

Step 2: Add Fish Repository

Add the official Fish shell repository ?

$ sudo add-apt-repository ppa:fish-shell/nightly-master

This repository contains regular builds of the most recent source of Fish shell, built from the Git master trunk at https://github.com/fish-shell/fish-shell/.

More info: https://launchpad.net/~fish-shell/+archive/ubuntu/nightly-master
Press [ENTER] to continue or ctrl-c to cancel adding it

Step 3: Update Package Lists

$ sudo apt-get update

Step 4: Install Fish Shell

$ sudo apt-get install fish

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  fish xsel
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 1,187 kB of archives.
After this operation, 6,568 kB of additional disk space will be used.
Do you want to continue? [Y/n] y

Using Fish Shell

Starting Fish Shell

Launch Fish shell with this command ?

$ fish

Welcome to fish, the friendly interactive shell
Type help for instructions on how to use fish

Checking Fish Version

$ echo $FISH_VERSION

2.2.0-680-ga701264

Smart Autosuggestions

Fish provides intelligent autosuggestions. Type partial commands like "da" and Fish suggests completions ?

$ da<span style="color: #808080">te</span>

Tue Mar 15 11:29:50 IST 2016

Syntax Highlighting

Fish automatically highlights commands with colors for better readability ?

$ echo "I am loving tutorialspoint"

I am loving tutorialspoint

Configuration Options

Setting Fish as Default Shell

$ chsh -s /usr/bin/fish

Switching Back to Bash

$ chsh -s /bin/bash

Accessing Help Documentation

Fish includes comprehensive built-in documentation ?

$ help

This opens Fish's web-based documentation in your default browser.

Conclusion

Fish shell offers a modern, user-friendly command-line experience with smart autosuggestions and syntax highlighting. Its intuitive design makes it an excellent choice for both beginners and experienced users seeking enhanced productivity.