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Full Discussion: Help with Awk
Top Forums Shell Programming and Scripting Help with Awk Post 302310977 by devtakh on Monday 27th of April 2009 02:00:28 PM
Old 04-27-2009
ENVIRON is an array provided by awk that stores the environment variables. each element of the array is the value in your current environment and the index is the name of the environment variable

so ENVIRON["DUP"] will give the path of the DUP environment variable in your machine. It may hapen that DUP does not exists in some machines.

try this to see what all environment variables exits in your system and then you will understand what the above code does

awk 'BEGIN{for (env in ENVIRON)print env "=" ENVIRON[env]}'


cheers,
Devaraj Takhellambam
 

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LEARN ABOUT BSD

environ

ENVIRON(7)						 Miscellaneous Information Manual						ENVIRON(7)

NAME

       environ - user environment

SYNOPSIS

       extern char **environ;

DESCRIPTION

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

       PATH    The sequence of directory prefixes that sh, time, nice(1), etc., apply in searching for a file known by an  incomplete  path  name.
	       The prefixes are separated by `:'.  Login(1) sets PATH=:/usr/ucb:/bin:/usr/bin.

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

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

       SHELL   The file name of the users login shell.

       TERMCAP The string describing the terminal in TERM, or the name of the termcap file, see termcap(5),termcap(3X).

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

       USER    The login name of the user.

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

       Further names may be placed in the environment by the export command and `name=value' arguments in sh(1), or by the setenv command  if  you
       use  csh(1).   Arguments  may  also be placed in the environment at the point of an execve(2).  It is unwise to conflict with certain sh(1)
       variables that are frequently exported by `.profile' files: MAIL, PS1, PS2, IFS.

SEE ALSO

       csh(1), ex(1), login(1), sh(1), execve(2), system(3), termcap(3X), termcap(5)

4.2 Berkeley Distribution					   May 20, 1985 							ENVIRON(7)
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