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Full Discussion: $PWD vs `pwd`
Top Forums UNIX for Dummies Questions & Answers $PWD vs `pwd` Post 302590656 by venkatareddy on Tuesday 17th of January 2012 05:39:19 AM
Old 01-17-2012
Hi,
Both are same w.r.t functionality , This variable points to the current directory

But $PWD is an environmental variable which can be used to set to a particular session/shell /script

Working principles of environment variables

A few simple principles govern how environment variables BY INSTALLING, achieve their effect.

Local to process

Environment variables are local to the process in which they were set. That means if we open two terminal windows (Two different processes running shell) and change value of environment variable in one window, that change will not be seen by other window.

Inheritance
When a child process is created, it inherits all the environment variables and their values from the parent process. Usually, when a program calls another program, it first creates a child process by forking, then the child adjusts the environment as needed and lastly the child replaces itself with the program to be called. This procedure gives the calling program control over the environment of the called program.

Case sensitive
In Unix and Unix-like systems the names of environment variables are case sensitive.
Persistence
Environment variables persistence can be session-wide or system-wide.

thanks,
venkat
 

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LEARN ABOUT CENTOS

pwd

PWD(1)								   User Commands							    PWD(1)

NAME

       pwd - print name of current/working directory

SYNOPSIS

       pwd [OPTION]...

DESCRIPTION

       Print the full filename of the current working directory.

       -L, --logical
	      use PWD from environment, even if it contains symlinks

       -P, --physical
	      avoid all symlinks

       --help display this help and exit

       --version
	      output version information and exit

       NOTE:  your shell may have its own version of pwd, which usually supersedes the version described here.	Please refer to your shell's docu-
       mentation for details about the options it supports.

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report pwd translation bugs to <http://translationproject.org/team/>

AUTHOR

       Written by Jim Meyering.

COPYRIGHT

       Copyright (C) 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       getcwd(3)

       The full documentation for pwd is maintained as a Texinfo manual.  If the info and pwd programs are properly installed at  your	site,  the
       command

	      info coreutils 'pwd invocation'

       should give you access to the complete manual.

GNU coreutils 8.22						     June 2014								    PWD(1)
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