The following is a list of all the commands that allow the use of an at sign modifier. If an at sign is used with a command other than one of the following, and the E2&4 flag bit is set, then TECO will issue a ATS error.
| Command | Description |
|---|---|
| ^A | Output text string |
| ^U | Copy text to Q-register |
| ! | Tag or comment |
| = | Print numeric value |
| E% | Write Q-register to file |
| EB | Edit backup |
| EG | Exit and go |
| EI | Execute indirect command file |
| EL | Open or close log file |
| EN | Search for matching files |
| EQ | Read file into Q-register |
| ER | Edit read |
| EW | Edit write |
| E_ | Global search w/o yank protection |
| FB | Bounded search |
| FC | Bounded search and replace |
| FD | Search and delete string |
| FK | Search and delete intervening text |
| FN | Global search and replace |
| FR | Replace last string |
| FS | Local search and replace |
| F_ | Destructive search and replace |
| I | Insert text string or character |
| N | Global search |
| O | GOTO tag |
| S | Local search |
| _ | Global search w/ yank protection |