Editing FOCAL (programming language) (section)

=== Editing commands ===
New lines are entered into a program by simply starting the command with a line number. The editing commands were <code>ERASE</code> (abbreviation E),{{sfn|Manual|1968|p=2.4}} <code>MODIFY</code> (abbreviation M),{{sfn|Manual|1968|p=3.8}} and <code>WRITE</code> (abbreviation W):{{sfn|Manual|1968|p=3.2}}
* <code>ERASE</code> – zero out all variables; this is sometimes used in programs to reset them
* <code>ERASE ''line number''</code> – delete the statement at a specified line
* <code>ERASE ''group number''</code> – delete all statements in a specified group
* <code>ERASE ALL</code> – delete an entire program
* <code>MODIFY ''line number''</code> – allow editing a specified line
* <code>WRITE ''line number''</code> – display the statement at a specified line
* <code>WRITE ''group number''</code> – display all statements in a specified group
* <code>WRITE ALL</code> – display a specified program