4.3BSD-Reno/share/man/cat7/environ.0

ENVIRON(7)		    UNIX Reference Manual		    ENVIRON(7)

NNAAMMEE
     eennvviirroonn - user environment

SSYYNNOOPPSSIISS
     _e_x_t_e_r_n _c_h_a_r **_e_n_v_i_r_o_n;

DDEESSCCRRIIPPTTIIOONN
     An array of strings called the _e_n_v_i_r_o_n_m_e_n_t is made available by execve(2)
     when a process begins.  By convention these strings have the form
     ``_n_a_m_e=_v_a_l_u_e''.  The following names are used by various commands:

     EXINIT    A startup list of commands read by ex(1), edit(1), and vi(1).

     HOME      A user's login directory, set by login(1) from the password
	       file passwd(5).

     PATH      The sequence of directories, separated by colons, searched by
	       csh(1), sh(1), system(3), execvp(3), etc, when looking for an
	       executable file.  PATH is set to ``:/usr/ucb:/bin:/usr/bin''
	       initially by login(1).

     PRINTER   The name of the default printer to be used by lpr(1), lpq(1),
	       and lprm(1).

     SHELL     The full pathname of the user's login shell.

     TERM      The kind of terminal for which output is to be prepared.  This
	       information is used by commands, such as nroff(1) or plot(1)
	       which may exploit special terminal capabilities.  See
	       /_u_s_r/_s_h_a_r_e/_m_i_s_c/_t_e_r_m_c_a_p (tmercap(5)) for a list of terminal
	       types.

     TERMCAP   The string describing the terminal in TERM, or, if it begins
	       with a '/', the name of the termcap file.  See TERMPATH below,
	       termcap(5), and termcap.

     TERMPATH
	       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 ``$_H_O_M_E/._t_e_r_m_c_a_p:/_e_t_c/_t_e_r_m_c_a_p''.  TERMPATH is ignored if
	       TERMCAP contains a full pathname.

     USER      The login name of the user.

     Further names may be placed in the environment by the export command and
     _n_a_m_e=_v_a_l_u_e arguments in sh(1), or by the setenv command if you use
     csh(1).  It is unwise to change certain sh(1) variables that are fre-
     quently exported by ._p_r_o_f_i_l_e files, such as MAIL, PS1, PS2, and IFS, un-
     less you know what you are doing.

SSEEEE AALLSSOO
     csh(1), ex(1), login(1), sh(1), execve(2), execle(3), system(3),
     termcap(3), termcap(5)

HHIISSTTOORRYY
     EEnnvviirroonn appeared in 4.2 BSD.