environ - User environment
extern char **environ;
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, system, 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.
.\" See /usr/share/misc/termcap for a list of terminal
types. .\"from TP " .\" Bold under TP !" --> 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.
Functions: exec(2), system(3)
Commands: csh(1), ex(1), login(1), sh(1)
environ(5)
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