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Full Discussion: one liner to extract path from PATH variable
Top Forums Shell Programming and Scripting one liner to extract path from PATH variable Post 302392570 by royalibrahim on Thursday 4th of February 2010 09:28:29 PM
Old 02-04-2010
one liner to extract path from PATH variable
Hi,

Could anyone help me in writing a single line code by either using (sed, awk, perl or whatever) to extract a specific path from the PATH environment variable?

for eg: suppose the PATH is being set as follows

Code:
PATH=/usr/bin/:/usr/local/bin:/bin:/usr/sbin:/usr/bin/java:/usr/bin/perl3.4

I need to check whether the string "java" is there (consider "java" appears exactly one time for the time being), if it does exist I need to extract the path "/usr/bin/java".

Note: java path may appear at any position (i.e) it may be the first or the last path or appear in middle of the PATH setting. So my code should be efficient in handling all these
 

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LEARN ABOUT DEBIAN

airport-hostmon

AIRPORT-HOSTMON(1)					      General Commands Manual						AIRPORT-HOSTMON(1)

NAME

       airport-hostmon - Host monitor for the original Apple AirPort Base Station ("Graphite"), the Lucent RG-1000 base station and the Apple Air-
       Port Extreme Base Station

SYNOPSIS

       airport-hostmon

DESCRIPTION

       airport-hostmon allows you to monitor the wireless hosts associated to your base station.

OPTIONS

       airport-hostmon accepts no command-line options. airport-hostmon is a wrapper  script  around  the  HostMonitor.jar  jar  file  located	in
       /usr/share/java/airport-utils.

       You  can set the JAVACMD environment variable to use a specific JVM instead of the one chosen by the wrapper script. Set the DEBUG environ-
       ment variable to 1 to get the debug output from the wrapper script.

ENVIRONMENT VARIABLES

       DEBUG  Set this variable to 1 to get the debug output from the wrapper script.

       JAVACMD
	      The full path to the Java Virtual Machine to use.  By  default,  the  wrapper  uses  JAVACMD;  if  it  is  not  set,  it	looks  for
	      JAVA_BINDIR/java, then for JAVA_HOME/bin/java before looking for a java executable in the PATH. In the latter case, the JVM used can
	      be configured using the Debian alternatives system (see update-alternatives(8)).

       JAVA_HOME
	      The full path where your JDK/JRE is installed.

       JAVA_BINDIR
	      The full path to the directory where the java executable is located.

       JAVA_ARGS
	      Extra command-line arguments to be passed to the Java Virtual Machine.

AUTHOR

       airport-hostmon was written by Jon Sevy <jsevy@cs.drexel.edu>.

       This manual page was written by Julien BLACHE <jblache@debian.org>, for the Debian project (but may be used by others).

								   May 20, 2006 						AIRPORT-HOSTMON(1)
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