Reduce the amount of typing. Many commands are typed directly in the shell

For examplepwd-> print working directory

This gap in word count is too big

You won’t have a problem using abbreviations when you get used to it

In fact, native English speakers actually prefer to write a few fewer words in abbreviations, such as IMO and the like

Try as little as possible on the terminal, people are very lazy. In addition, foreigners have the habit of abbreviating, and foreigners can know what many abbreviations mean at a glance.
Because many commands are so commonly used, some people will be lazy and want to type faster when they are used. A typical example:

ls -a => la
ls -l =>ll
cd /home/yourname  =>cd ~

In oh my zsh, cd .. becomes..

Problems of efficiency in writing code