Combine awk commands into one Post: 302979539

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Top Forums Shell Programming and Scripting Combine awk commands into one Post 302979539 by Don Cragun on Tuesday 16th of August 2016 04:35:14 AM

08-16-2016

Registered User

I refuse to attempt to do 1-liners where I can't see what it is doing. And, with no sample variable values and no sample data to work on and no description of the expected output, this is obviously totally untested, but should come close to what your unreadable pipeline did:

Code:

gawk -v ll="$LASTLINENUM" -v le="$LINEENDNUM" -v s1="$STRING1" \
     -v s2="$STRING2" -v bg="$BEFOREGLAF" -v ag="$AFTERGLAF" '
NR <= ll || NR > le {
	ndel++
	next
}
{	l[NR - ndel] = $0
}
$0 ~ s1 && $0 ~ s2 {
	for(i = NR - ndel - bg; i <= NR - ndel + ag; i++)
		o[i] = i
	t++
}
END {	for(i = 1; i <= NR - ndel; i++)
		if(o[i])
			print l[i]
	print t+0
}' "$LOGFILE"

I think that the expression NR - ndel keeps track of the NR value that would have been seen in the second awk script. Without understanding what the shell variables BEFOREGLAF and AFTERGLAF are doing in your script, I have no idea whether or not any of the ndel calculations are needed as is, could be simplified by changing those two shell variables, or could just be skipped entirely.

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LEARN ABOUT REDHAT

esdctl

ESDCTL(1)						     Enlightened Sound Daemon							 ESDCTL(1)

NAME

       esdctl - The Enlightened Sound Daemon

DESCRIPTION

       Command-line control program for EsounD

USAGE

       esdctl [options] [command]

       options: "-s", --server=host:port contact esd server on host at port

       commands:

	lock			      foreign clients may not use the server
	unlock			      foreign clients may use the server
	standby, off		      suspend sound output for other programs
	resume, on		      resume sound output
	cache sample		      cache a sample in the server
	getid name		      retrieve a sample id from its name
	free name		      uncache a sample in the server
	play name		      play a cached sample once
	loop name		      make a cached sample loop
	stop name		      stop the looping sample at end
	serverinfo		      get server info from server
	allinfo 		      get player and sample info from server
	panstream id left right set   panning for a stream
	pansample id left right set   default panning for a sample
				      - left/right pan values scaled to 256.
	standbymode		      see if server's on standby, etc.

SEE ALSO

       esd(1), esdcat(1), esddsp(1), esdloop(1), esdplay(1), esdsample(1), esd-config(1), esdfilt(1), esdmon(1), esdrec(1)

3rd Berkeley Distribution					   EsounD 0.2.28							 ESDCTL(1)

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