sed command to print first instance of pattern in range


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# 1  
[solved] sed command to print first instance of pattern in range

The following text is in testFile.txt:
Code:
one 5
two 10
three 15
four 20
five 25
six 10
seven 35
eight 10
nine 45
ten 50

I'd like to use sed to print the first occurance of search pattern /10/ in a given range. This command is to be run against large log files, so to optimize efficiency, I'd like to use sed's q command to stop processing after reaching the first matching pattern. For example, to print the first occurance of /10/ in the range of lines from 2 to end-of-file, it should function like the following.

Code:
sed -n '2,${/10/p;}' testFile.txt | head -1

This will generate output of only the following line:
Code:
two 10

Sed version: installed with OS, AIX 5.3 TL 12.

Last edited by uschaafm; 02-12-2013 at 03:03 PM.. Reason: updating thread as solved.
# 2  
try:
Code:
sed -n '2,${/10/!n; p; q; }' testFile.txt


Last edited by rdrtx1; 02-11-2013 at 08:40 PM.. Reason: corrected for not match at line 2 as in example posted, as allister pointed out.
# 3  
Just add the 'q;' option to quit after the first match:

Code:
sed -n '2,${/10/p;q;}' testFile.txt
two 10

# 4  
Code:
sed -n '/10/ {p;q}' file

# 5  
using for n grep

I'm nt cmfortable wid sed. Bt i thunk it can be done using for loop n grep. As i'm posting through mobile so code isn't testd. Plz modify to meet ur need
Code:
for $ln `cat testfile.txt`
{
  num=echo $ln | grep -Po *[0-9]{2}
 if [ $num = '10' ]
 echo $ln
exit 0
fi
}


it'll search upto first occurance n then exit. Plz revrt incase of furthr explanation

Last edited by Franklin52; 02-13-2013 at 06:13 AM.. Reason: Please use code tags for data and code samples
# 6  
Quote:
Originally Posted by rdrtx1
try:
Code:
sed -n '2,${/10/p; q;}' testFile.txt

Quote:
Originally Posted by in2nix4life
Just add the 'q;' option to quit after the first match:

Code:
sed -n '2,${/10/p;q;}' testFile.txt
two 10

Your suggestions unconditionally abort after reading line 2, and will generate incorrect output if the first instance of matching text within the range does not occur on the first line of that range.

Quote:
Originally Posted by shamrock
Code:
sed -n '/10/ {p;q}' file

This suggestion does not implement the range restriction.

A correct, sed-only solution:
Code:
sed -n '2,${/10/!d; p; q;}'

If the end of the range is not the end of the file, then an additional check is needed to avoid reading the remainder of a long file which does not match. Taking the range to be 2,50:
Code:
sed -ne '2,50{/10/!d; p; q;}' -e '50q'

Regards,
Alister

Last edited by alister; 02-11-2013 at 07:33 PM..
This User Gave Thanks to alister For This Post:
# 7  
No point in printing before or reading after:
Code:
sed '
  /10/{
    p
    q
   }
  d
 '

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