Definitions (LaTeX2e unofficial reference manual (November 2018))

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## 12 Definitions

LaTeX has support for making new commands of many different kinds.

• \newcommand & \renewcommand: |  | (Re)define a new command.
• \providecommand: |  | Define a new command, if name not used.
• \makeatletter & \makeatother: |  | Change the status of the at-sign character.
• \@ifstar: |  | Define your own commands with *-variants.
• \newcounter: |  | Define a new counter.
• \newlength: |  | Define a new length.
• \newsavebox: |  | Define a new box.
• \newenvironment & \renewenvironment: |  | Define a new environment.
• \newtheorem: |  | Define a new theorem-like environment.
• \newfont: |  | Define a new font name.
• \protect: |  | Using tricky commands.
• \ignorespaces & \ignorespacesafterend: |  | Discard extra spaces.

Unofficial LaTeX2e reference manual