ENV(3)ENV(3)NAMEenv - 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 con‐
tents; changes made by one process are seen by the others. A process
can insulate itself from further changes using the 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 environ‐
ment group is created by the option to sys-pctl(2).
SOURCE
/os/port/devenv.c
/emu/port/devenv.c
SEE ALSOenv(1), sh(1), env(2), sys-pctl(2)ENV(3)
