man.postnix Miscellaneous man pages of Plan 9 related material

     ENV(2)                                                     ENV(2)

     NAME
          env - environment module

     SYNOPSIS
          include "env.m";
          env = load Env Env->PATH;

          getenv: fn(var: string): string;
          setenv: fn(var: string, val: string): int;
          getall: fn(): list of (string, string);
          clone:  fn(): int;
          new:    fn(): int;

     DESCRIPTION
          Env provides an interface to manipulate environment vari-
          ables which may then be shared between processes.  Getenv
          returns the value of the environment variable var passed as
          a parameter, or nil if the variable is not set. It does this
          by reading the contents of /env/var.  Setenv sets the value
          of the environment variable var to val. The value may be nil
          to unset the variable. It does this by writing the string
          val to /env/var.  The routine returns a negative number if
          it fails to set the variable for any reason.  Getall returns
          all the variables in the current environment as a list of
          (variable, value) pairs.  Clone copies the current environ-
          ment and places the process in a new environment group.
          Changes now made to the environment will not affect the
          environment of other processes.  New places the process in a
          new empty environment group. Changes made in this new envi-
          ronment will not affect other processes.

     SOURCE
          /appl/lib/env.b

     SEE ALSO
          env(1), sys-pctl(2), env(3)

     Page 1                       Plan 9             (printed 4/19/24)