Ubuntu-L1-Cadet

File & Directory Navigation

1. pwd — Show the current working directory

   pwd

2. ls — List files and directories

   ls
   ls -l
   ls -a

3. cd — Change directory

   cd Documents
   cd ..
   cd ~

4. tree — Display directory structure as a tree (install first)

   sudo apt install tree
   tree

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File & Directory Management

1. touch — Create an empty file

   touch file.txt

2. mkdir — Create a directory

   mkdir myfolder

3. rmdir — Delete an empty directory

   rmdir myfolder

4. rm — Remove files or directories

   rm file.txt
   rm -r foldername

5. cp — Copy files or directories

   cp file1.txt file2.txt
   cp -r dir1 dir2

6. mv — Move or rename files

   mv old.txt new.txt
   mv file.txt /tmp/

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Viewing & Reading Files

1. cat — Display file contents

   cat file.txt

2. less — View file page by page

   less file.txt

3. head — View first lines of a file

   head file.txt

4. tail — View last lines of a file

   tail file.txt
   tail -f logfile.log

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System & User Information

1. whoami — Show current user

   whoami

2. uname -a — Show system information

   uname -a

3. df -h — Show disk usage

   df -h

4. free -h — Show memory usage

   free -h

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Package Management (Ubuntu-specific)

1. sudo — Run command as administrator

   sudo apt update

2. apt update — Update package list

   sudo apt update

3. apt install — Install software

   sudo apt install git

4. apt remove — Remove software

   sudo apt remove git

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Searching & Help

1. find — Search for files

   find . -name file.txt

2. grep — Search text inside files

   grep "error" logfile.txt

3. man — View command manual

   man ls

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