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fish suggests commands as you type, based on command history, completions, and valid file paths. As you type commands, you will see a completion offered after the cursor, in a muted gray color (which can be changed with the fish_color_autosuggestion variable). However, you can NEVER turn them off! See More
Being POSIX-compliant may be essential to some, but it is not the be-all-and-end-all. Much of the trouble with POSIX-compliant shells is BECAUSE of POSIX, since it captures the poor behavior and syntax that existed. In most cases, POSIX-compliance is a fool's errand since there are significant differences between implementations of even the same shell (e.g., Bash, etc.) on various platforms. Although fish tries not to break POSIX compatibility without a good reason, and despite efforts to implement a compatibility mechanism, you can face some issues if POSIX compatibility is expected/required. Though, enthusiasts fix these cases. For example, add set shell=sh in your .vimrc to solve the issue for vim. See More
Fish has no support for !!, but you can use Oh My Fish shell framework and install bang-bang plugin to have this shortcut in Fish shell. The downside of using bang-bang is that it takes over ones default key bindings, for those that don't use them it should not be an issue but for those that do it is an annoyance to be considered. For sudo !!, this can also be achieved by making this custom function: function sudo
if test "$argv" = !!
eval command sudo $history[1]
else
command sudo $argv
end
end See More
While other shells require a lot of set up to act the way you want them to and to have some useful features, fish works perfectly out of the box. It has all the most widely used features baked in and are there out of the box without having the need to install plugins or tweak any configuration files. See More
Here is a sample. Notice that there are 2 files with spaces in names. ls produces a valid list, and for loop correctly iterated through its values. ➤ for a in (ls); ls -l $a; end
-rw-rw-r-- 1 sashka sashka 0 Apr 19 03:16 alma mater.txt
-rw-rw-r-- 1 sashka sashka 0 Apr 19 03:16 whatever i want.txt sh scripts tend to be fragile when there are lists containing values with spaces. Also: ➤ echo $PATH
/usr/bin /bin /usr/sbin /sbin /usr/local/bin
➤ echo $PATH[1]
/usr/bin
➤ echo $PATH[-1]
/usr/local/bin See More
Because it needs very little configuration to work properly, you can use Fish everywhere. If you are working on a system you don't usually work, installing Fish from the repository is easy and will give you the same experience as the installation on your own machine without having to drag a dotfile around. See More
Zsh will take you through a procedure which is roughly 30 minutes in length before during install. Through this procedure it asks you to set different options and customize the shell the way you want it to. Most of these settings are also found in other shells, but to customize them you have to go dig configuration files while zsh allows you to do it in the beginning. See More