| Purpose | Example |
|---|
| Names of Tcl keywords and functions, and Motif class names | Note that the expr function takes only a single argument. |
| Names of commands and options that you enter on the command line | The windowing shell wishx allows you to run Tcl/Tk interactively. |
| Titles of manuals | Refer to the IRIXpro Administrator's Guide. |
| A term defined in the hypertext glossary | Tcl is an embeddable language. |
| Filenames and pathnames | The compiler automatically includes libc.so and libm.so from /usr/lib. |
| Code or commands you type as input, with variable elements in italic | cc -g sourcename.c -ltk -ltcl |
| Exact quotes of computer output | Error: invalid command name |