Essential CLI commands

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Crossposted on my blog
You can read it here

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Terminal vs Shells

Terminal and shells are not the same things, even if they are used as synonymous.

Command must be written in the syntax expected by your shell.

This article is written for zsh shell, the one I'm using in my Mac.

CLI General Reminders

• File extensions are not necessary for "doing things", extensions are used to mark which format the information is written in. Outside CLI context, extensions are used by the OS to pick an appropriate Application and use it to open a file. In CLI context they "are just the final part of the file name", so when you create a script file it's good practice to include an extension that indicate that is a script (.sh .command .script)
• Which folder you are in does not count, but :
  • when referencing file path using a "relative" approach, the starting point is your current folder (knows as cwd, current working directory)
  • when referencing file path using a "relative" approach, it is irrelevant.

Commands

Here is a list of essential CLI commands for your daily tasks...

Print absolute path of current directory

# pwd (print working directory)
pwd

Show files/folder of a directory

# show files of current directory
ls
# show files of other directory
ls path/to/directory
# show as list (easily scannable)
ls -l
# include hidden files
ls -a

Show the file tree of a directory

# Install the "tree" command if on MacOS
brew install tree

# show tree with depth level = 1
tree -L 1

# output
.
├── Summer_Forest.mp4
├── dummy-assets
├── prove
├── text.txt
└── screenshot

# show tree with depth level = 2
tree -L 2

# output
.
├── Summer_Forest.mp4
├── dummy-assets
│   ├── artist
│   ├── images
│   └── travel
├── prove
│   ├── Schermata 2023-07-16 alle 20.33.14.png
│   ├── Schermata 2023-07-16 alle 20.33.22.png
│   ├── Schermata 2023-09-14 alle 21.56.02.png
│   ├── Schermata 2024-01-21 alle 17.56.25.png
│   ├── Schermata 2024-01-24 alle 21.57.38.png
│   ├── Schermata 2024-02-09 alle 18.39.27.png
│   ├── Schermata 2024-02-09 alle 18.39.54.png
│   ├── Schermata 2024-02-09 alle 18.55.26.png
│   ├── Schermata 2024-02-28 alle 10.39.45.png
│   ├── Schermata 2024-02-28 alle 13.06.00.png
│   ├── Schermata 2024-02-28 alle 14.41.22.png
│   ├── Schermata 2024-03-03 alle 16.29.49.png
│   ├── Schermata 2024-03-04 alle 17.11.15.png
│   ├── Schermata 2024-03-04 alle 18.05.51.png
│   ├── Schermata 2024-03-08 alle 17.50.21.png
│   ├── Schermata 2024-03-09 alle 15.36.57.png
│   └── Schermata 2024-03-11 alle 13.50.38.png
├── text.txt
└── screenshot
    ├── Schermata 2024-01-30 alle 17.28.04.png
    └── Schermata 2024-02-26 alle 14.52.17.png

Go to a directory

Change current directory with provided one

# go to dir (named "dirName") that is child of current directory
cd dirName 
# go to dir (named "dirName") knowing its absolute path
cd /absolute/path/to/dirName
# go to parent directory
cd ..
# go to home directory
# in MacOS home directory is /Users/your-name
cd ~

Create a directory

# create a new directory named "dirName" as child of current dir
mkdir dirName

Create a file

# create a new file named "fileName" as child of current dir
touch fileName

Edit a file with a text editor

# with "nano" text editor
nano fileName.txt
# with "vs code" text editor
code fileName.txt
# with "vim" text editor
vi fileName.txt
# with "micro text editor
micro fileName.txt

Open a file with the default app used by the OS

# open a file named "fileName" with OS default app
open fileName.png

Show in Finder/File Explorer a directory

# show current dir (do not miss the dot)
open .
# show a dir using absolute path
open /abs/path/to/dir

Conclusion

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