IRAF help page for package language, program envget

• varname

envget varname

varname

Envget returns the string value of the named environment variable. The user is prompted for the value if the variable has not yet been defined.

1. Construct a filename using the value of the environment variable "editor", and page the file thus named.

cl> page ("dev$" // envget ("editor") // ".ed")

2. Compute and print the center line on the terminal screen.

cl> = ((int (envget ("ttynlines")) + 1) / 2)

set, show,