CLI Checkoff

What command prints the current working directory?

pwd

How do we change directory?

cd

How do you change to the parent directory?

cd ..

How do you change to the home directory quickly?

cd ~ or just cd

What’s the difference between an absolute and relative path?

Absolute starts at root /; relative starts from your current pwd

Create a new directory called project.

mkdir project

Create an empty file called notes.txt.

touch notes.txt

Copy file.txt to backup.txt.

cp file.txt backup.txt

Copy a directory and its contents.

cp -r dir1 dir2

Rename old.txt to new.txt.

mv old.txt new.txt

Move report.txt into the docs/ directory.

mv report.txt docs/

Delete file.txt.

rm file.txt

Delete a directory and everything inside it.

rm -r dirname

Safely delete interactively (prompt before delete).

rm -ri dirname

List all files in current directory

ls

Show hidden files too

ls -a

View a file’s contents at once.

cat file.txt

View a long file one page at a time.

less file.txt

How do you clear the terminal?

clear

Search for “error” in log.txt.

grep "error" log.txt

Case-insensitive search for “error” in log.txt

grep -i "error" log.txt

Find all .txt files in current directory and subdirectories.

find . -name "*.txt"

Pipe output of ls into grep to find .py files.

ls | grep ".py"

Show all recently run commands

history

Search history for “grep”.

history | grep grep

Append “hello” to notes.txt without overwriting.

echo "hello" >> notes.txt

Save output of ls into list.txt, replacing existing file.

ls > list.txt

What is the root directory called?

/

What is the single dot . in a directory?

A link to the current directory.

What is the double dot .. in a directory?

A link to the parent directory

Show a directory tree structure visually.

tree