09-05-2009
Path
Hi, i have two servers,
one is not funtioning properly. they are both to do the same thing as one is a back up and it comes in when the other is down.
when i type echo $PATH, they show different things on the two servers but when i got to the /.profile and /etc/profile they show the same thing on the two servers.
one of them is not able to start any programs and even some commands like boot,halt, shutdown etc.
can you please let me know where to find the actual PATH?
Last edited by ryks; 09-05-2009 at 01:09 PM..
Reason: mistake
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LEARN ABOUT DEBIAN
envpath
ENVPATH(1p) User Contributed Perl Documentation ENVPATH(1p)
NAME
envpath - Advanced operations on path variables
SYNOPSIS
Run this script with the "-help" option for usage details.
DESCRIPTION
Parses the command line, modifies the specified path variable(s), and execs the remaining arguments. There are two modes, simple and
advanced:
SIMPLE MODE
Simple mode presents an alternative, platform-independent syntax for specifying paths wherein the path separator is "," and environment
variables can be expanded with @NAME@. For example
envpath PATH=@PATH@,/usr/ucb -- printenv PATH
appends "/usr/ucb" to $PATH and execs printenv PATH. The "--" is optional.
You can also specify prepending or appending by using "+=" or "=+" respectively:
# place /usr/ucb at the front
envpath PATH+=/usr/ucb -- printenv PATH
# place /usr/ucb at the back
envpath PATH=+/usr/ucb -- printenv PATH
Simple mode requires only this script; it does not require Env::Path to be installed.
ADVANCED MODE
Advanced mode basically provides command-line access to the features of Env::Path (see), which must be installed. The "-E" flag selects the
path variable to operate on and other flags specify operations on it. E.g.
envpath -E MANPATH -A /tmp -R /usr/share/man -N -U -- man ...
would take MANPATH, append /tmp to it, remove any references to "/usr/share/man", remove any dirs which don't exist ("-N") and remove
redundant entries ("-U") before running man.
The -Whence option allows patterns. Thus
envpath -W "cat*"
would find all programs on PATH which match cat*.
CLEARCASE WINKINS
A big part of the motivation for this script was for use with ClearCase builds; iff you know or care about ClearCase read on. Typically,
during builds (and not just with ClearCase), pathvars such as PATH, CLASSPATH, and LD_LIBRARY_PATH must be strictly controlled. One choice
is to force static values of these into the environment during the build process, another is to simply require/expect users to set their
paths appropriately. Each of these can lead to subtle build or runtime errors, however, and makes it hard for new users to get up to speed
since their personal environment must be just so.
Another common choice is to use only full pathnames within the Makefile, avoiding reliance on search paths at all. This is often the best
way to go but can suppress ClearCase winkins. For example, say you're generating ascii files of some type with a binary executable you
just built:
$(INCDIR)/foo.h: $(BINDIR)/foomaker $(BINDIR)/foomaker ...
The problem with this is that $(BINDIR) likely contains a platform part such as 'solaris' or 'hpux', which makes it impossible to wink in
the foo.h file on other platforms even though it's ascii. This same thing could come up even with a standard pre-built utility that's in
different places on different platforms; "yacc", for instance, is in /usr/bin on Linux and /usr/ccs/bin on Solaris.
You could modify the path on the fly:
$(INCDIR)/foo.h: $(BINDIR)/foomaker PATH=$(BINDIR)$(SEP)$$PATH foomaker ...
but this suffers from the same problem: since $(BINDIR) and $PATH are expanded literally within the build script they'll suppress winkins.
Here's a solution using envpath:
$(INCDIR)/foo.h: $(BINDIR)/foomaker envpath PATH=@BINDIR@,@PATH@ foomaker ...
This hides the evaluation of BINDIR and PATH such that clearmake never sees anything but the literals, thus clearing the field for winkins.
Of course envpath is capable of doing more than this, but it's the original reason it was written.
AUTHOR
David Boyce <dsbperl AT boyski.com>
COPYRIGHT
Copyright (c) 2000-2001 David Boyce. All rights reserved. This Perl program is free software; you may redistribute and/or modify it under
the same terms as Perl itself.
SEE ALSO
perl(1), "perldoc Env::Path"
perl v5.10.1 2003-10-10 ENVPATH(1p)