environ

environ -- user environment

strings called the environment of the form name=value.

BLOCKSIZE used by df, du, ls and others.
byte by specifying a number, kilobyte using K or k, megabyte M or m and gigabyte G or g.
EXINIT startup commands read by editors
HOME user's login directory, set by login from /etc/passwd.
PATH sequence of directories searched by shells, system(3), execvp(3), etc, when looking for executables .
PRINTER default printer
SHELL full pathname of the user's login shell.
TERM type of terminal in use /usr/share/misc/termcap (TERMCAP)
TERMCAP string describing the capabilities of terminal in TERM or the name of the termcap file.
TERMPATH pathnames for termcap files, searched for terminal capabilities. Defaults to $HOME/.termcap:/etc/termcap, ignored if TERMCAP is a full pathname.
TMPDIR directory for temporary files. Defaults to /tmp or /var/tmp. May be deleted at system startup.
TZ timezone to use when displaying dates. The normal format is a pathname relative to /usr/share/zoneinfo. For example, the command env TZ=US/Pacific date displays the current time in California. See tzset(3) for more information.
LOGNAME login name of the user.
USER Deprecated synonym of LOGNAME (for backwards compatibility).

related to a particular locale as displayed by locale
(example monetary denomination dollars, pounds, yen... date format mm-dd-yy , dd-mm-yy).

LANG= LC_ALL LC_CTYPE="POSIX" LC_NUMERIC="POSIX" LC_TIME="POSIX" LC_COLLATE="POSIX" LC_MONETARY="POSIX" LC_MESSAGES="POSIX" LC_PAPER="POSIX" LC_NAME="POSIX" LC_ADDRESS="POSIX" LC_TELEPHONE="POSIX" LC_MEASUREMENT="POSIX" LC_IDENTIFICATION="POSIX"

The author of any script or command can define which names in the environment are used.

Additional entries are placed in the environment with export and name=value arguments in sh, or by the setenv command in csh.
Following is the environment for a CGI script on this host
BASH=/bin/sh BASH_VERSINFO=([0]="2" [1]="05b" [2]="0" [3]="1" [4]="release" [5]="i386-redhat-linux-gnu") BASH_VERSION='2.05b.0(1)-release' DIRSTACK=() DOCUMENT_ROOT=/home/real1/public_html EUID=32284 GATEWAY_INTERFACE=CGI/1.1 GROUPS=() HOSTNAME=esc45.midphase.com HOSTTYPE=i386 HTTP_ACCEPT='text/xml,application/xml,application/xhtml+xml, text/html;q=0.9,text/plain;q=0.8, image/png,*/*;q=0.5' HTTP_ACCEPT_ENCODING='gzip, deflate' HTTP_ACCEPT_LANGUAGE=en-us HTTP_CONNECTION=keep-alive HTTP_COOKIE='C=54; L=1121725408; U=1194191939' HTTP_HOST=www.tems.com HTTP_USER_AGENT='Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) AppleWebKit/523.10.6 (KHTML, like Gecko) Version/3.0.4 Safari/523.10.6' IFS=' ' MACHTYPE=i386-redhat-linux-gnu OPTERR=1 OPTIND=1 OSTYPE=linux-gnu PATH=/usr/local/bin:/usr/bin:/bin PIPESTATUS=([0]="0") POSIXLY_CORRECT=y PPID=2141 PS4='+ ' PWD=/home/real1/public_html QUERY_STRING= REDIRECT_STATUS=500 REDIRECT_URL=/birding/log/birdlogert.cgi REMOTE_ADDR=9.25.15.11 REMOTE_PORT=50178 REQUEST_METHOD=GET REQUEST_URI=/birding/log/birdlogert.cgi SCRIPT_FILENAME=/home/rear1/public_html/500.cgi SCRIPT_NAME=/500.cgi SERVER_ADDR=26.14.34.54 SERVER_ADMIN=web@tems.com SERVER_NAME=www.tems.com SERVER_PORT=80 SERVER_PROTOCOL=HTTP/1.1 SERVER_SOFTWARE='Apache/1.3.37 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/ 1.2 mod_bwlimited/1.4 PHP/4.4.4 FrontPage/5.0.2.2635.SR1.2 mod_ssl/ 2.8.28 OpenSSL/0.9.7a' SHELL=/usr/local/cpanel/bin/jailshell SHELLOPTS=braceexpand:hashall:interactive-comments:posix SHLVL=1 TERM=dumb UID=32284 _='+%m/%d %H:%M:%S '
Environment on the same host as a terminal
BASH=/usr/local/cpanel/bin/jailshell BASH_VERSINFO=([0]="2" [1]="05b" [2]="0" [3]="1" [4]="release" [5]="i386-redhat-linux-gnu") BASH_VERSION='2.05b.0(1)-release' CLASSPATH=.:/usr/local/jdk/lib/classes.zip COLORS=/etc/DIR_COLORS COLUMNS=110 DIRSTACK=() DNS=tems.com EDITOR=vi EUID=32284 EXINIT='set showmode ignorecase ruler tabstop=4 mesg verbose exrc' GREP_COLOR=red GROUPS=() G_BROKEN_FILENAMES=1 HISTFILE=/home/real1/.bash_history HISTFILESIZE=1000 HISTSIZE=1000 HOME=/home/real1 HOSTNAME=esc4.se.com HOSTTYPE=i386 HTML=/home/user/mar/public_html IFS=$' \t\n INPUTRC=/etc/inputrc JAVA_HOME=/usr/local/jdk LANGVAR= LESS='-X --LONG-PROMPT -P file\:%f\ %Pb\%\ \ \ help,forward,back,quit, / (srch)' LESSOPEN='|/usr/bin/lesspipe.sh %s' LINES=32 LOGNAME=real1 LS_COLORS='no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do=01;35:bd=40;33;01: cd=40;33;01:or=40;31;01:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31: *.taz=01;31:*.lzh=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31: *.bz2=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.jpg=01;35: *.jpeg=01;35: *.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35: *.ppm=01;35:*.tga=01;35: *.xbm=01;35:*.xpm=01;35:*.tif=01;35: *.tiff=01;35:*.png=01;35:*.mpg=01;35: *.mpeg=01;35:*.avi=01;35: *.fli=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.ogg=01;35: *.mp3=01;35:*.wav=01;35:' LS_OPTIONS='--color=tty -F -a -b -T 0' MACHTYPE=i386-redhat-linux-gnu MAIL=/var/spool/mail/realger1 MAILCHECK=60 MANPATH=/usr/lib/courier-imap/man: OLDPWD=/home/realger1/www OPTERR=1 OPTIND=1 OSTYPE=linux-gnu PAGER=less PATH=/home/real1/.bin:/usr/local/jdk/bin:/usr/kerberos/bin:/usr/lib/courier-imap/bin: /usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/bin:/usr/X11R6/bin: /usr/libexec:/home/real1/bin PIPESTATUS=([0]="0") PPID=25032 PS1='$PWD > ' PS2='> ' PS4='+ ' PWD=/home/real1/www/docs RWS=Real-World-Systems.com SHELL=/usr/local/cpanel/bin/jailshell SHELLOPTS=braceexpand:hashall:histexpand:interactive-comments:monitor:vi SHLVL=1 SSH_CLIENT='9.2.15.11 50978 22' SSH_CONNECTION='9.2.15.11 50978 26.14.4.5 22' SSH_TTY=/dev/pts/0 TERM=xterm-color TZ=US/Eastern UID=32284 USER=realger1 VISUAL=pico _=environ.7.html today='Jan 18' whoami=real1 x=28
SEE bash, csh, ex, login, sh, execve, execle, system, termcap, termcap.5

`BLOCKSIZE`	used by df, du, ls and others. byte by specifying a number, kilobyte using `K` or `k`, megabyte `M` or `m` and gigabyte `G` or `g`.
`EXINIT`	startup commands read by editors
`HOME`	user's login directory, set by `login` from `/etc/passwd`.
`PATH`	sequence of directories searched by shells, system(3), execvp(3), etc, when looking for executables .
`PRINTER`	default printer
`SHELL`	full pathname of the user's login shell.
`TERM`	type of terminal in use /usr/share/misc/termcap (`TERMCAP`)
`TERMCAP`	string describing the capabilities of terminal in TERM or the name of the termcap file.
`TERMPATH`	pathnames for termcap files, searched for terminal capabilities. Defaults to `$HOME/.termcap:/etc/termcap`, ignored if `TERMCAP` is a full pathname.
`TMPDIR`	directory for temporary files. Defaults to `/tmp` or `/var/tmp`. May be deleted at system startup.
`TZ`	timezone to use when displaying dates. The normal format is a pathname relative to `/usr/share/zoneinfo`. For example, the command `env TZ=US/Pacific date` displays the current time in California. See tzset(3) for more information.
`LOGNAME`	login name of the user.
`USER`	Deprecated synonym of LOGNAME (for backwards compatibility).
related to a particular locale as displayed by locale (example monetary denomination dollars, pounds, yen... date format mm-dd-yy , dd-mm-yy).
LANG= LC_ALL LC_CTYPE="POSIX" LC_NUMERIC="POSIX" LC_TIME="POSIX" LC_COLLATE="POSIX" LC_MONETARY="POSIX" LC_MESSAGES="POSIX" LC_PAPER="POSIX" LC_NAME="POSIX" LC_ADDRESS="POSIX" LC_TELEPHONE="POSIX" LC_MEASUREMENT="POSIX" LC_IDENTIFICATION="POSIX"