0x02-shell_redirections

shell I/O redirections and filters

Intro

Deep dive into shell I/O redirection, special characters and filters

Resources

1. Shell IO
2. Special characters

Man or Help

• echo
• cat
• head
• tail
• find
• wc
• sort
• uniq
• grep
• tr
• rev
• cut
• passwd (5) (i.e. man 5 passwd)

Learning objectives

By the end of this project, you should be able to explain to anyone Without the help of google the following concepts

Shell I/O redirection

• What do the commands head, tail, find, wc, sort, uniq, grep, tr do
• How to redirect standard output to a file
• How to get standard input from a file instead of the keyboard
• How to send the output from one program to the input of another program
• How to combine commands and filters with redirections

Special characters

• What are special characters
• Understand what do the white spaces, single quotes, double quotes, backslash, comment, pipe, command separator, tilde and how and when to use them

Other man pages

• How to display a line of text
• How to concatenate files and print on the standard output
• How to reverse a string
• How to remove sections from each line of files
• What is the /etc/passwd file and what is its format
• What is the /etc/shadow file and what is its format

Quizes

Quiz

More info

Read your /etc/passwd and /etc/shadow files.

Note: You do not have to learn about fmt, pr, du, gzip, tar, lpr, sed and awk yet.