Exercise

Aliasing Away Typos Exercise

Task

Turn a typo you keep making into a working command, and a dangerous command into a safer one, in every shell from now on.

List the aliases the shell already defines
```
alias
```
RHEL defines very few Mostly --color wrappers around the grep family. RHEL 10 has no ls or ll alias, so anything of that sort is yours to create.
Alias a typo you make often

Move somewhere with something to list, confirm the typo fails, then define the alias.
```
cd /etc
sl
alias sl='ls'
sl
```
Bypass an alias once

An alias can shadow a real command. Make rm ask first, then answer n so the file survives.
```
cd ~
alias rm='rm -i'
touch scratch_file.txt
rm scratch_file.txt
```
A backslash runs the real command, with no prompt.
```
\rm scratch_file.txt
ls scratch_file.txt
```
Confirm the aliases are gone in a new session

Log out of servera and log back in.
```
exit
ssh servera
alias
sl
```
Put them in ~/.bashrc.d/aliases

Aliases could go straight into ~/.bashrc, but they are easier to find in a file of their own. The directory does not exist yet, so create it.
```
mkdir -p ~/.bashrc.d
vim ~/.bashrc.d/aliases
```
```
alias sl='ls'
alias rm='rm -i'
```
```
exit
ssh servera
alias
sl
```
You never edited ~/.bashrc The loop at the bottom of ~/.bashrc sources everything in ~/.bashrc.d/ for you. By the end of today you will be able to read that loop.