CheetSheet.md

Basics Cheet Sheet

ls

---

List files

This command is used to show the files that are in the current directory, another directory, or files that match some pattern.

marshall@cerberus:bash-intro (master)$ ls
CheetSheet.md	LICENSE		README.md	testDir

ls [flags] [files ...]

Below is a table showing some of the arguments that can be used

flag	description
-a	show hidden files
-l	show details of the file
-G or --color	color the output by file type

cd

---

Change Directory

This command can be used to navigate to another directory.

marshall@cerberus:~/bash-intro$ cd testDir
marshall@cerberus:~/bash-intro/testDir$ 

cd path

There are some special location symbols

symbol	meaning
~	home directory
.	current directory
..	parrent direcotry
/	root (top) directory
-	previous directory

touch

---

Create file

This is a simple command to create a file, or update its modification time.

marshall@cerberus:~/bash-intro/testDir$ ls
marshall@cerberus:~/bash-intro/testDir$ touch awsomeFile.txt
marshall@cerberus:~/bash-intro/testDir$ ls
awsomeFile.txt
marshall@cerberus:~/bash-intro/testDir$

touch fileName

mkdir

---

Create Directory

This command can be used to create a new directories

marshall@cerberus:~/bash-intro$ ls
marshall@cerberus:~/bash-intro$ mkdir folder
marshall@cerberus:~/bash-intro$ ls
folder

mkdir name

If the name contains other directories that do not yet exist they can be created as well by using the -p flag.

rm

---

Remove

This command is potentially dangerous and can be used to remove files and folders

marshall@cerberus:~/bash-intro$ ls
deleteMe.txt
marshall@cerberus:~/bash-intro$ rm deleteMe.txt
marshall@cerberus:~/bash-intro$ ls
marshall@cerberus:~/bash-intro$

rm [flags] names

Below is a table showing some of the arguments that can be used

flag	description
-f	attempt to delete it forcefully, dont ask for confirmation
-r or -R	recursive, delete all the files in the folders too

cat

---

Print files

This is a simple command to print the contents of a file

marshall@cerberus:~/bash-intro/$ ls
CheetSheet.md LICENSE       README.md     testDir
marshall@cerberus:~/bash-intro$ cat README.md 
# bash-intro
Content  for the into to bash workshop
awsomeFile.txt
marshall@cerberus:~/bash-intro/testDir$

cat fileName ...

If you want to show line numbers in the output the -n flag can be used.

echo

---

White to stdout

This command will output what ever you give it to the screen. Its usefull for printing variables, or piping strings into other functions (more on this later).

marshall@cerberus:~/bash-intro/$ echo "Hey there"
Hey there
marshall@cerberus:~/bash-intro$ echo "$HOME"
/Users/marshall
marshall@cerberus:~/bash-intro/testDir$ 

echo string ...