# Comprehensive SED Cheat Sheet

## Table of Contents

1. [SED Basics](#sed-basics)
2. [Print Operations](#print-operations)
3. [Substitution](#substitution)
4. [Deletion](#deletion)
5. [Insertion](#insertion)
6. [Append and Replace](#append-and-replace)
7. [Selective Printing](#selective-printing)
8. [Text Formatting](#text-formatting)
9. [Multiple Commands](#multiple-commands)
10. [Regular Expressions](#regular-expressions)
11. [Grouping and Backreferences](#grouping-and-backreferences)
12. [File In-Place Editing](#file-in-place-editing)
13. [SED Scripts](#sed-scripts)

## SED Basics

### Basic Syntax

```bash
sed 'command' filename
```

### In-Place Editing

```bash
sed -i 'command' filename
```

## Print Operations

```bash
# Print All Lines
sed -n 'p' filename

# Print Line Numbers
sed -n '10p' filename

# Print Range of Lines
sed -n '5,10p' filename
```

## Substitution

```bash
# Substitute Text
sed 's/pattern/replacement/' filename

# Global Substitution
sed 's/pattern/replacement/g' filename
```

## Deletion

```bash
# Delete Matching Lines
sed '/pattern/d' filename

# Delete Lines by Number
sed '5d' filename
```

## Insertion

```bash
# Insert Line Before Matching Pattern
sed '/pattern/i new_line' filename
```

## Append and Replace

```bash
# Append Line After Matching Pattern
sed '/pattern/a new_line' filename

# Replace Line with New Text
sed '/pattern/c new_line' filename
```

## Selective Printing

```bash
# Print Lines Matching Pattern
sed -n '/pattern/p' filename
```

## Text Formatting

```bash
# Convert to Uppercase
sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' filename
```

## Multiple Commands

```bash
# Execute Multiple Commands
sed -e 'command1' -e 'command2' filename
```

## Regular Expressions

```bash
# Use Regular Expressions
sed '/^pattern/s/replacement/' filename
```

## Grouping and Backreferences

```bash
# Use Grouping and Backreferences
sed 's/\(pattern1\)\(pattern2\)/\2\1/' filename
```

## File In-Place Editing

```bash
# In-Place Editing with Backup
sed -i.bak 's/pattern/replacement/' filename
```

## SED Scripts

```bash
# Create and Use SED Script
echo 's/pattern/replacement/' > myscript.sed
sed -f myscript.sed filename
```