# Features Overview
## Core Features
### PATH Management
#### Directory Operations
- Safe directory addition
- Controlled directory removal
- Duplicate prevention
- Order preservation
- Relative path expansion
#### Validation
- Directory existence verification
- Permission checking
- Path normalization
- Invalid entry detection
- Syntax validation
### Backup System
#### Backup Modes
- **Default Mode**
- Backs up both PATH and shell config
- Maximum safety for system changes
- Recommended for most users
- **PATH-only Mode**
- Backs up PATH entries only
- Lighter weight option
- Faster operation
- **Shell-only Mode**
- Backs up shell configuration
- Preserves shell customizations
- Config file safety
#### Backup Operations
- Automatic pre-modification backups
- Timestamped backup files
- JSON format storage
- Easy restoration
- History tracking
### Shell Support
#### Supported Shells
- **bash**
- Primary shell support
- .bashrc management
- PATH export handling
- **zsh**
- Full zsh compatibility
- .zshrc management
- path array support
- **fish**
- fish shell integration
- config.fish handling
- fish_add_path support
- **tcsh/csh**
- C shell compatibility
- .tcshrc management
- setenv PATH support
- **ksh**
- Korn shell support
- .kshrc management
- typeset handling
#### Configuration Management
- Automatic shell detection
- Config file backups
- Safe file modifications
- Permission handling
- Syntax preservation
## Safety Features
### Automatic Backups
- Pre-modification state preservation
- Timestamped versions
- Multiple backup points
- Quick recovery options
### Error Prevention
- Path validation before changes
- Permission verification
- Configuration syntax checking
- Duplicate entry prevention
### Recovery Options
- Point-in-time restoration
- Configuration recovery
- Shell config preservation
- Emergency restore
## Performance Features
### Efficient Operation
- Quick path lookups
- Fast validation
- Minimal system impact
- Resource-conscious design
### Memory Management
- Small memory footprint
- Efficient data structures
- Clean resource handling
- Proper cleanup
## User Experience
### Clear Feedback
- Operation status messages
- Error explanations
- Change summaries
- Backup confirmations
### Flexibility
- Multiple operation modes
- Various shell support
- Custom configurations
- Adaptable workflows
## Future Features
### Planned Enhancements
- Additional backup formats
- More shell integrations
- Enhanced validation options
- Extended configuration options
### Integration Options
- Script integration
- System integration
- Framework compatibility
- Tool interoperability