Index: stable/12/share/man/man7/environ.7
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--- stable/12/share/man/man7/environ.7	(revision 364141)
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@@ -1,264 +1,314 @@
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 .\"	@(#)environ.7	8.3 (Berkeley) 4/19/94
 .\" $FreeBSD$
 .\"
-.Dd February 14, 2020
+.Dd August 5, 2020
 .Dt ENVIRON 7
 .Os
 .Sh NAME
 .Nm environ
 .Nd user environment
 .Sh SYNOPSIS
 .Ar extern char **environ ;
 .Sh DESCRIPTION
-An array of strings called the
+An array of strings, called the
 .Ar environment
-is made available by
+is made available to each process by
 .Xr execve 2
 when a process begins.
 By convention these strings have the form
-.Dq Ar name=value .
-The following names are used by various commands:
-.Bl -tag -width LC_MONETARY
+.Va name Ns No = Ns Ar value ,
+and are referred to as
+.Dq environment variables .
+A process can query, update, and delete these strings using the
+.Xr getenv 3 ,
+.Xr setenv 3 ,
+and
+.Xr unsetenv 3
+functions, respectively.
+The shells also provide commands to manipulate the environment;
+they are described in the respective shell manual pages.
+.Pp
+What follows is a list of environment variables typically
+seen on a
+.Ux
+system.
+It includes only those variables that a user can expect to see during their
+day-to-day use of the system, and is far from complete.
+Environment variables specific to a particular program or library function
+are documented in the
+.Sx ENVIRONMENT
+section of the appropriate manual page.
+.Sh ENVIRONMENT
+.Bl -tag -width LD_LIBRARY_PATH
 .It Ev BLOCKSIZE
-The size of the block units used by several commands, most notably
+The size of the block units used by several disk-related commands,
+most notably
 .Xr df 1 ,
 .Xr du 1
 and
 .Xr ls 1 .
+.Ev BLOCKSIZE
+may be specified in units of a byte by specifying a number,
+in units of a kilobyte by specifying a number followed by
+.Ql K
+or
+.Ql k ,
+in units of a megabyte by specifying a number followed by
+.Ql M
+or
+.Ql m ,
+and in units of a gigabyte by specifying a number followed
+by
+.Ql G
+or
+.Ql g .
+Sizes less than 512 bytes or greater than a gigabyte are ignored.
 This variable is processed by the
 .Xr getbsize 3
 function.
 .It Ev COLUMNS
 The user's preferred width in column positions for the terminal.
 Utilities such as
 .Xr ls 1
 and
 .Xr who 1
 use this to format output into columns.
 If unset or empty, utilities will use an
 .Xr ioctl 2
 call to ask the terminal driver for the width.
 .It Ev EDITOR
 Default editor name.
 .It Ev EXINIT
 A startup list of commands read by
 .Xr ex 1
 and
 .Xr vi 1 .
 .It Ev HOME
 A user's login directory, set by
 .Xr login 1
 from the password file
 .Xr passwd 5 .
 .It Ev LANG
 This variable configures all programs which use
 .Xr setlocale 3
 to use the specified locale unless the
 .Ev LC_*
 variables are set.
 .It Ev LC_ALL
 Overrides the values of
 .Ev LC_COLLATE ,
 .Ev LC_CTYPE ,
 .Ev LC_MESSAGES ,
 .Ev LC_MONETARY ,
 .Ev LC_NUMERIC ,
 .Ev LC_TIME
 and
 .Ev LANG .
 .It Ev LC_COLLATE
 Locale to be used for ordering of strings.
 .It Ev LC_CTYPE
 Locale to be used for character classification
 (letter, space, digit, etc.) and for interpreting byte sequences as
 multibyte characters.
 .It Ev LC_MESSAGES
 Locale to be used for diagnostic messages.
 .It Ev LC_MONETARY
 Locale to be used for interpreting monetary input
 and formatting output.
 .It Ev LC_NUMERIC
 Locale to be used for interpreting numeric input and
 formatting output.
 .It Ev LC_TIME
 Locale to be used for interpreting dates input and
 for formatting output.
 .It Ev MAIL
 The location of the user's
 mailbox instead of the default in /var/mail,
 used by
 .Xr mail 1 ,
 .Xr sh 1 ,
 and many other mail clients.
+.It Ev MANPATH
+The sequence of directories, separated by colons, searched by
+.Xr man 1
+when looking for manual pages.
 .It Ev NLSPATH
 List of directories to be searched for the message catalog referred to by
 .Ev LC_MESSAGES .
 See
 .Xr catopen 3 .
 .It Ev PAGER
 Default paginator program.
 The program specified by this variable is used by
 .Xr mail 1 ,
 .Xr man 1 ,
 .Xr ftp 1 ,
 etc, to display information which is longer than the current display.
 .It Ev PATH
 The sequence of directories, separated by colons, searched by
 .Xr csh 1 ,
 .Xr sh 1 ,
 .Xr system 3 ,
 .Xr execvp 3 ,
 etc, when looking for an executable file.
 .Ev PATH
 is set to ``/usr/bin:/bin'' initially by
 .Xr login 1 .
+.It Ev POSIXLY_CORRECT
+When set to any value, this environment variable modifies the behaviour
+of certain commands to (mostly) execute in a strictly POSIX-compliant manner.
 .It Ev PRINTER
 The name of the default printer to be used by
 .Xr lpr 1 ,
 .Xr lpq 1 ,
 and
 .Xr lprm 1 .
 .It Ev PWD
 The current directory pathname.
 .It Ev SHELL
 The full pathname of the user's login shell.
 .It Ev TERM
 The kind of terminal for which output is to be prepared.
 This information is used by commands, such as
 .Xr nroff 1
 or
 .Xr plot 1
 which may exploit special terminal capabilities.
 See
 .Pa /usr/share/misc/termcap
 .Pq Xr termcap 5
 for a list of terminal types.
 .It Ev TERMCAP
 The string describing the terminal in
 .Ev TERM ,
 or, if
 it begins with a '/', the name of the termcap file.
 See
 .Ev TERMPATH
 below, and
 .Xr termcap 5 .
 .It Ev 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
 .Ev TERMPATH
 is equivalent to a
 .Ev TERMPATH
 of
-.Dq Pa $HOME/.termcap:/etc/termcap .
+.Pa $HOME/.termcap:/etc/termcap .
 .Ev TERMPATH
 is ignored if
 .Ev TERMCAP
 contains a full pathname.
 .It Ev TMPDIR
 The directory in which to store temporary files.
 Most applications use either
-.Dq /tmp
+.Pa /tmp
 or
-.Dq /var/tmp .
+.Pa /var/tmp .
 Setting this variable will make them use another directory.
 .It Ev TZ
 The timezone to use when displaying dates.
 The normal format is a pathname relative to
-.Dq Pa /usr/share/zoneinfo .
+.Pa /usr/share/zoneinfo .
 For example, the command
-.Dq env TZ=America/Los_Angeles date
+.Pp
+.Dl env TZ=America/Los_Angeles date
+.Pp
 displays the current time in California.
 See
 .Xr tzset 3
 for more information.
 .It Ev USER
 The login name of the user.
+It is recommended that portable applications use
+.Ev LOGNAME
+instead.
 .El
 .Pp
 Further names may be placed in the environment by the
 .Ic export
 command and
 .Ar name=value
 arguments in
 .Xr sh 1 ,
 or by the
 .Ic setenv
 command if you use
 .Xr csh 1 .
 It is unwise to change certain
 .Xr sh 1
 variables that are frequently exported by
 .Pa .profile
 files, such as
 .Ev MAIL ,
 .Ev PS1 ,
 .Ev PS2 ,
 and
 .Ev IFS ,
 unless you know what you are doing.
 .Pp
 The current environment variables can be printed with
 .Xr env 1 ,
 .Xr set 1
 or
 .Xr printenv 1
 in
 .Xr sh 1
 and
 .Xr env 1 ,
 .Xr printenv 1
 or the
 .Cm printenv
 built-in command in
 .Xr csh 1 .
 .Sh SEE ALSO
 .Xr cd 1 ,
 .Xr csh 1 ,
 .Xr env 1 ,
 .Xr ex 1 ,
 .Xr login 1 ,
 .Xr printenv 1 ,
 .Xr sh 1 ,
 .Xr execve 2 ,
 .Xr execle 3 ,
 .Xr getbsize 3 ,
 .Xr getenv 3 ,
 .Xr setenv 3 ,
 .Xr setlocale 3 ,
 .Xr system 3 ,
 .Xr termcap 3 ,
 .Xr termcap 5
 .Sh HISTORY
 The
 .Nm
 manual page appeared in
 .At v7 .
Index: stable/12
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--- stable/12	(revision 364141)
+++ stable/12	(revision 364142)

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