sed [options] 'command' file
sed [options] -e 'command1' -e 'command2' file

# Print semua baris (default behavior)
sed '' file.txt
sed -n 'p' file.txt

# Print baris tertentu
sed -n '5p' file.txt        # Line 5
sed -n '5,10p' file.txt     # Lines 5-10
sed -n '$p' file.txt        # Last line
sed -n '1~2p' file.txt      # Every 2nd line starting from 1

# Print multiple ranges
sed -n '1p;5p;10p' file.txt

# Replace text (hanya first occurrence per line)
sed 's/old/new/' file.txt

# Replace all occurrences dalam line (global)
sed 's/old/new/g' file.txt

# Replace specific occurrence
sed 's/old/new/2' file.txt    # Replace 2nd occurrence
sed 's/old/new/2g' file.txt   # Replace 2nd dan seterusnya

# Use different delimiters (useful untuk paths)
sed 's|/usr/local|/opt|g' file.txt
sed 's#/home/user#/data#g' file.txt
sed 's_old_new_g' file.txt

# Case insensitive
sed 's/old/new/gi' file.txt

# Only print modified lines
sed -n 's/old/new/gp' file.txt

# Capture groups dengan backreferences
sed 's/\(.*\):\(.*\)/\2: \1/' file.txt

# Replace dengan line number
sed = file.txt | sed 'N; s/\n/ /'

# Replace dengan environment variable
sed "s/USER/$USER/g" file.txt

# Replace only specific lines
sed '5s/old/new/' file.txt      # Line 5 only
sed '/pattern/s/old/new/' file.txt  # Lines matching pattern
sed '1,10s/old/new/' file.txt   # Lines 1-10

# Delete baris tertentu
sed '5d' file.txt             # Delete line 5
sed '5,10d' file.txt          # Delete lines 5-10
sed '$d' file.txt             # Delete last line
sed '1d' file.txt             # Delete first line

# Delete based on pattern
sed '/pattern/d' file.txt     # Delete lines with pattern
sed '/pattern/!d' file.txt    # Delete lines NOT matching pattern

# Delete blank lines
sed '/^$/d' file.txt
sed '/^[[:space:]]*$/d' file.txt

# Delete lines dengan whitespace only
sed '/^[[:space:]]*$/d' file.txt

# Insert before line
sed '5i\This is new line' file.txt

# Append after line
sed '5a\This is appended' file.txt

# Insert multiple lines
sed '5i\
Line 1\
Line 2\
Line 3' file.txt

# Append after last line
sed '$a\This is last' file.txt

# Insert at beginning of file
sed '1i\# Header' file.txt

# Single line
sed '5s/old/new/' file.txt

# Line range
sed '5,10s/old/new/' file.txt

# From line to end
sed '5,$s/old/new/' file.txt

# Pattern matching
sed '/start/,/end/s/old/new/' file.txt

# Regex pattern
sed '/^#/s/old/new/' file.txt

# Multiple addresses
sed -e '1s/^/START/' -e '$s/$/END/' file.txt

# Process range
sed -n '/START/,/END/p' file.txt

# Delete range
sed '/START/,/END/d' file.txt

# Substitute dalam range
sed '/START/,/END/s/foo/bar/' file.txt

# Multiple sed commands
sed -e 's/foo/bar/' -e 's/baz/qux/' file.txt

# Command file
sed -f commands.sed file.txt

# Commands dalam file commands.sed:
# s/foo/bar/
# s/baz/qux/
# 5d

# Edit file in-place (backup original)
sed -i.bak 's/foo/bar/g' file.txt

# Edit file in-place tanpa backup
sed -i 's/foo/bar/g' file.txt

# Edit multiple files
sed -i 's/foo/bar/g' *.txt

# Print next line juga
sed -n '/pattern/{N;p}' file.txt

# Join lines
sed ':a;N;$!ba;s/\n/ /g' file.txt

# Delete newlines
sed ':a;N;$!ba;s/\n//g' file.txt

# Merge every 2 lines
sed 'N;s/\n/ /' file.txt

# Swap line order
sed 'n;G;h;P;d' file.txt

# Convert ke uppercase
sed 's/.*/\U&/' file.txt

# Convert ke lowercase
sed 's/.*/\L&/' file.txt

# Capitalize first letter
sed 's/.*/\u&/' file.txt

# Title case (setiap word)
sed 's/\b\([a-z]\)/\u\1/g' file.txt

# Remove comments dan blank lines
sed '/^[[:space:]]*#/d; /^[[:space:]]*$/d' config.conf

# Add line numbers
sed = file.txt | sed 'N; s/\n/ /'

# Double space file
sed G file.txt

# Reverse lines of file
sed '1!G;h;$!d' file.txt

# Remove trailing whitespace
sed 's/[[:space:]]*$//' file.txt

# Remove leading whitespace
sed 's/^[[:space:]]*//' file.txt

# Remove both leading dan trailing
sed 's/^[[:space:]]*//;s/[[:space:]]*$//' file.txt

# Indent each line dengan 4 spaces
sed 's/^/    /' file.txt

# Convert spaces ke tabs
sed 's/  */	/g' file.txt

# Convert tabs ke spaces
sed 's/	/    /g' file.txt

# Remove ANSI color codes
sed 's/\x1B\[[0-9;]*[JKmsu]//g' file.txt

# URL encode
sed 's/ /%20/g' file.txt

# Wrap long lines at 80 characters
sed -n -e ':a' -e 's/^\(.\{80\}\)/\1\\/;ta' -e 'p' file.txt

# Uncomment line
sed -i 's/^#Port 22/Port 22/' /etc/ssh/sshd_config

# Change value
sed -i 's/^Port 22/Port 2222/' /etc/ssh/sshd_config

# Add setting if not exists
sed -i '/^#*Port 22/!a\Port 2222' /etc/ssh/sshd_config

# Delete setting
sed -i '/^PermitRootLogin yes/d' /etc/ssh/sshd_config

# Replace dalam tag HTML
sed 's/<[^>]*>//g' file.html