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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 ex- ecve() function when a process begins. By convention these strings have the form name=value. The following names are used by various com- mands: 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 se- quence 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 ter- minal 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)