envget: Get the string value of an environment variable

Package: language

Usage

envget varname

Parameters

varname

The environment variable whose value is to be returned.

Description

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.

Examples

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)

See also

set, show