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Need help with grep

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Top Forums Shell Programming and Scripting Need help with grep
# 8  
Old 06-05-2014
@mohtashims: grep != awk
# 9  
Old 06-05-2014
Quote:
Originally Posted by Akshay Hegde
Also try
Code:
$ cat file
JAVA Memory arguments: -XX:ParallelGCThreads=12 -XX:+UseParNewGC=24 -XX:+UseConcMarkSweepGC -Xms2048m -Xmx2048m -XX:PermSize=256m -XX:MaxPermSize=256m -XX:NewSize=800m -XX
:MaxNewSize=800m .......

Code:
$ awk '/UseParNewGC=/' RS="[: +]" file
UseParNewGC=24

use nawk on sunos/solaris
With this I am getting the entire line not just the required value on the command line output Smilie
# 10  
Old 06-05-2014
Why don't try Scrutinizer's solution ?
# 11  
Old 06-05-2014
Quote:
Originally Posted by Akshay Hegde
Also try
[..]
Code:
$ awk '/UseParNewGC=/' RS="[: +]" file
UseParNewGC=24

use nawk on sunos/solaris
RS="[: +]" = mawk / GNU awk only...

Standard awk only allows for a single character for RS
This User Gave Thanks to Scrutinizer For This Post:
Akshay Hegde
# 12  
Old 06-05-2014
Quote:
Originally Posted by mohtashims
With this I am getting the entire line not just the required value on the command line output Smilie
It worked with sample if you miss RS="[: +]" yes it prints entire line.

--
Thanks Scrutinizer for note, I don't have nawk to test
Last edited by Akshay Hegde; 06-05-2014 at 11:27 AM.. Reason: Thanks Scrutinizer
# 13  
Old 06-05-2014
Quote:
Originally Posted by Scrutinizer
Code:
sed -n 's/.*\(UseParNewGC=[0-9]*\).*/\1/p' file

--
For awk solutions: on Solaris use /usr/xpg4/bin/awk rather than awk
sed works fine !!, but i how can i check if sed yields a result or not ?

its says sed command success if [ $? -eq 0 ]; then
 in every case.

---------- Post updated at 09:44 AM ---------- Previous update was at 09:43 AM ----------

Quote:
Originally Posted by Scrutinizer
@mohtashims: grep != awk

No matter which awk i use all the suggestions of awk yield entire file as output not just that particular value.
# 14  
Old 06-05-2014
Quote:
Originally Posted by mohtashims
sed works fine !!, but i how can i check if sed yields a result or not ?

its says sed command success if [ $? -eq 0 ]; then
 in every case.
You can test if the result is non-empty.. or you can modify an awk solution to generate a return code

Quote:
No matter which awk i use all the suggestions of awk yield entire file as output not just that particular value.
pilnet101 's solution should work..



----
Quote:
Originally Posted by pilnet101
Code:
awk 'match(tolower($0),/useparnewgc=[0-9]*[^0-9]/){print substr($0,RSTART,RLENGTH)}'  output.txt

If it is the last bit on the line then it could fail. You could use /useparnewgc=[0-9]*/ instead..
Last edited by Scrutinizer; 06-05-2014 at 12:29 PM..
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