environ(5)							File Formats Manual							environ(5)

NAME

       environ - User environment

SYNOPSIS

       extern char **environ;

DESCRIPTION

       An  array  of strings called the environment is made available by the execve() function when a process begins.  By convention these strings
       have the form name=value. The following names are used by various commands: A startup list of commands read by ex, edit, and vi.  A  user's
       login  directory,  set by login from the password file passwd.  The sequence of directories, separated by colons, searched by csh, sh, sys-
       tem, execvp, etc, when looking for an executable file.  PATH is set to :/usr/ucb:/bin:/usr/bin initially by login.  The name of the default
       printer	to  be	used  by lpr, lpq, and lprm.  The full pathname of the user's login shell.  The kind of terminal for which output is to be
       prepared. This information is used by commands, such as nroff which may exploit special terminal capabilities.  The string  describing  the
       terminal in the TERM environment variable, or, if it begins with a / (slash), the name of the termcap file. See TERMPATH below.	A sequence
       of pathnames of termcap files, separated by colons or spaces, which are searched for terminal descriptions in the order listed.	Having	no
       TERMPATH  is  equivalent to a TERMPATH of $HOME/.termcap:/etc/termcap.  TERMPATH is ignored if TERMCAP contains a full pathname.  The login
       name of the user.

       Further names may be placed in the environment by the export command and name=value arguments in sh, or by the setenv command  if  you  use
       csh. It is unwise to change certain sh variables that are frequently exported by files, such as MAIL, PS1, PS2, and IFS.

SEE ALSO

       Functions: exec(2), system(3)

       Commands: csh(1), ex(1), login(1), sh(1)

																	environ(5)