awk to print specific line in file based on criteria Post: 302982047

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Top Forums Shell Programming and Scripting awk to print specific line in file based on criteria Post 302982047 by Don Cragun on Thursday 22nd of September 2016 03:31:54 PM

09-22-2016

Registered User

Hi cmccabe,
If I correctly understand your specification, you could also try this alternative using your original input field separator specification:

Code:

awk -F"\"[,:]* *\"*" '
{	for(i = 2; i < NF - 3; i++)
		if($i       == "path" &&
		   $(i + 2) == "plugin" &&
		   $(i + 3) == "/rundb/api/v1/plugin/49/")
			print $(i + 1)
}
' file

(and I must say that that is a nicely constructed field separator ERE). You could simplify it a little bit using single quotes to avoid needing to escape the double quotes: -F'"[,:]* *"*'.

Hi R. Singh,
Note that using -F"[\"|:|,]" specifies that any ", |, :, |, or , character is to be treated as a field separator because every character in a bracket expression (other than the backslash used to escape a double-quote in a shell double-quoted string) is a match. There is no alternation in a bracket expression. You could get the same effect (unless you really wanted | to be a field separator) with -F'[":,]' (using a matching bracket expression) or with -F'"|:|,' (using alternation without a bracket expression). And, if there were any | characters in the input, your expression would interpret them as field separators instead of as data.

Last edited by Don Cragun; 09-23-2016 at 05:13 AM.. Reason: Fix typo: s/needed/needing/

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LEARN ABOUT REDHAT

gst-inspect

GStreamer(1)						      General Commands Manual						      GStreamer(1)

NAME

       gst-inspect - print info about a GStreamer plugin or element

SYNOPSIS

       gst-register [OPTION...] [PLUGIN|ELEMENT]

DESCRIPTION

       gst-inspect  is	a  tool  that prints out information on available GStreamer plugins, information about a particular plugin, or information
       about a particular element.  When executed with no PLUGIN or ELEMENT argument, gst-inspect will print a list of all plugins  and  elements.
       When executed with a PLUGIN or ELEMENT argument, gst-inspect will print information about that plug-in or element.

OPTIONS

       gst-inspect accepts the following arguments and options:

       PLUGIN  Name of a plugin

       ELEMENT Name of an element

       --help  Print help synopsis and available FLAGS

       --gst-info-mask=FLAGS
	       GStreamer info flags to set (list with --help)

       --gst-debug-mask=FLAGS
	       GStreamer debugging flags to set (list with --help)

       --gst-mask=FLAGS
	       GStreamer info and debugging flags to set (list with --help)

       --gst-plugin-spew
	       GStreamer info flags to set Enable printout of errors while loading GStreamer plugins

       --gst-plugin-path=PATH
	       Add directories separated with ':' to the plugin search path

SEE ALSO

       gst-register(1), gst-launch(1)

AUTHOR

       The GStreamer team at http://gstreamer.net/

								    March 2001							      GStreamer(1)

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