Exam 1 Review for CEG 2350

Intro topics

1. Shells
   • Windows: powershell, cmd
   • Linux / Mac: bash, sh, zsh
2. SSH
   • the command, its options, and structure of information
   • private key files (location and permissions)
   • public keys and the authorized_keys file

Files, directories, and OS structure

1. Filesystem structure in Linux, Mac, and Windows
2. Files vs directories
3. Commands: ls, cp, mkdir, rmdir, vim, mv, rm, cd, cat, touch, head/tail, less/more, ln
4. Importance of names and extensions (file)
5. Ownership & sharing
   • rwx permissions in Linux
   • user vs. group vs. other
   • creating users & groups (and naming rules)
   • chmod, chown, chgrp, adduser, deluser
   • sudo & the root user

Scripting

1. Environment variables
   • HOME
   • USER
   • SHELL
   • PATH
2. Aliases & customizations (.bashrc, .profile)
3. Commands: diff, find, file, wc, sort, uniq, whereis, which

4. IO streams (standard input, output (1) and error (2)) and redirection (<, >, »,

   , tee)

5. executing scripts
   • within current bash shell (source (or .)
   • by specifying interpreter (bash)
   • by specifying the intepreter with #! (./)
   • by name from any location (adding path to PATH)
6. Scripting languages: bash
   • variables
   • reading input
   • printf vs echo
   • arguments
   • conditionals (test)
   • if
   • for
   • while
   • case
7. Regular expressions
8. grep (search)

Git (version control)

1. Version control as a concept
2. Steps to clone with ssh for authentication
3. Basic commands:
   • clone
   • add
   • commit
   • push
   • pull
   • status