on.exit {base} | R Documentation

## Function Exit Code

### Description

`on.exit` records the expression given as its argument as needing to be executed when the current function exits (either naturally or as the result of an error). This is useful for resetting graphical parameters or performing other cleanup actions.

### Usage

    on.exit(expr, add = FALSE)

### Arguments

`expr` | an expression to be executed.
`add` | if TRUE, add `expr` to be executed after any previously set expressions.

### See Also

`sys.on.exit` to see the current expression.

### Examples

    opar <- par(mai = c(1,1,1,1))
    on.exit(par(opar))