- increase, Controlling Processes
- indented, Text manipulation tools
- index, Who would want to read this guide? , Contributors
- indication, Controlling Processes
- individual, Help , Text Viewing Tools
- info, Help , Controlling Processes , Text manipulation tools , Network Commands , Working with MS-DOS files , Wildcards , Useful categories of characters (as defined by the POSIX standard) , General Further Reading
- Info Pages, Online Info Page Website:
- information, Who would not want to read this guide? , Legal , General Shell Tips , Help , Working with files and folders , Mass Rename/copy/link Tools , Finding information about the system , Finding information about partitions , Controlling Processes , Users/Groups , Finding Text Within Files , Network Commands , Network Configuration , Internet Specific Commands , Security , Archiving Files , rsync , Miscellaneous , Mini-Guides , Duplicating disks , Regular Expressions
- inode, File Permissions
- input, The Unix Tools Philosophy , Concept Definitions , Usage , Working with files and folders , Finding information about the system , Text manipulation tools , Mathematical tools
- insensitive, Finding files
- insert, Usage
- inside, Standard Wildcards (globbing patterns)
- inspection, Network Commands
- install, Archiving Files
- installed, Help ,

