▶ Linux for Beginners Playlist:
https://www.youtube.com/playlist?list=PLUHnYREC5ofibzDBqvIxjdWhDmSjfrnIa

In this lesson, you will learn how Linux handles standard input, standard output, and standard error. We will cover redirection, pipes, tee, /dev/null, and the most useful text filtering tools like grep, sort, uniq, wc, cut, tr, awk, and sed. These are essential Linux basics for shell work, log analysis, and DevOps practice.

00: 00 Introduction
00: 33 stdin, stdout, and stderr explained
02: 36 Output redirection in Linux
05: 48 Linux pipe and tee command
08: 32 /dev/null explained
10: 58 grep and basic regular expressions
13: 47 sort, uniq -c, and wc -l
16: 32 cut and tr commands
19: 23 awk for columns
21: 52 sed for simple text replacement
23: 20 Lesson summary

Commands used in this lesson:
grep — searches for lines that match a word or pattern
grep -i — searches without case sensitivity
grep -v — shows lines that do not match the pattern
sort — sorts lines alphabetically
uniq — removes adjacent duplicate lines
uniq -c — counts repeated lines
wc -l — counts the number of lines
cut — extracts selected parts of each line
cut -d: -f1 — takes the first field separated by a colon
tr — replaces or deletes individual characters
awk — processes text by fields and columns
awk ‘{print $1}’ — prints the first column
sed — edits text in a stream
sed ‘s/old/new/’ — replaces the first match in a line
tee — shows output on the screen and saves it to a file
tee -a — appends output to the end of a file

#Linux #Ubuntu #DevOps