How to grep repeated string on the same line?

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How to grep repeated string on the same line?

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05-03-2019

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How to grep repeated string on the same line?

I have this a file.txt with one line, whose content is

Code:

/app/jdk/java/bin/java -server -Xms3g -Xmx3g -XX:MaxPermSize=256m -Dweblogic.Name=O2pPod8_mapp_msrv1_1 -Djava.security.policy=/app/Oracle/Middleware/Oracle_Home/wlserver/server/lib/weblogic.policy -Djava.security.egd=file:/dev/./urandom -Dweblogic.ProductionModeEnabled=true -Dweblogic.system.BootIdentityFile=/app/Oracle/Middleware/Oracle_Home/user_projects/domains/O2pPod8_domain/servers/O2pPod8_mapp_msrv1_1/data/nodemanager/boot.properties -Dweblogic.nodemanager.ServiceEnabled=true -Dweblogic.nmservice.RotationEnabled=true -Dweblogic.security.SSL.ignoreHostnameVerification=false -Dweblogic.ReverseDNSAllowed=false -Xms8192m -Xmx8192m -XX:MaxPermSize=2048m -XX:NewSize=1300m -XX:MaxNewSize=1300m -XX:SurvivorRatio=4 -XX:TargetSurvivorRatio=90 -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled

and when I do

Code:

cat file.txt | grep -io "Xms.*" | awk '{FS" ";  print $1} ' | cut -d  "s" -f2

output:

Code:

3g

why is grep not reading the second occurrence, i.e. I expect 3g and 8192m.
Infact, how do I print only 8192m in this case?

Last edited by Don Cragun; 05-03-2019 at 05:48 AM.. Reason: Add CODE and ICODE tags.

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If you want to print second occurrence try like this

Code:

$ awk -F"Xms" ' { sub(" .*","",$3); print $3 } ' file.txt
8192m

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When you have one line of input and you use grep to throw away the first part of the line and awk to throw away everything after the first <space> in what was left, you're not going to get much but the first value you were looking for.

Getting rid of the unneeded cat, grep, and cut and using awk to do all of what they were doing to get the results you want, you could try something more like:

Code:

awk '
{	for(i = NF; i > 0; i--)
		if($i ~ /^-Xms/) {
			print substr($i, 5)
			exit
		}
}' file.txt

If you really need a case insensitive search for Xms (which isn't needed with your input sample), you could change the start of the if statement to:

Code:

		if($i ~ /^-[Xx][Mm][Ss]/) {

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A little variation of your own initial attempt:

Code:

$ grep -io "Xms[^ ]*" file.txt | cut -d  "s" -f2
3g
8192m

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