ENV 3
NAME
env - environment device
SYNOPSIS
bind #e /env /env/ name
DESCRIPTION
The environment device serves a one-level directory giving access to environment variables
and their values.
It is conventionally bound to
/env . The value of an environment variable
name may be obtained by reading the file
/env/ name. If the file does not exist, the variable is unset and has the value nil. The
maximum length of a variable name is 127 bytes.
New environment variables are set by creating the corresponding file in /env and writing the required value to that file. Similarly environment variables are destroyed (unset) by removing the corresponding file.
Processes sharing an `environment group' see the same files and contents; changes made by one process are seen by the others. A process can insulate itself from further changes using the .L FORKENV option to sys-pctl (2), which creates a new environment group that is a copy of the old, but further changes in each are independent. A new empty environment group is created by the .L NEWENV option to sys-pctl (2).
SOURCE
/os/port/devenv.c SEE ALSO
env (1), sh (1), env (2), sys-pctl (2)