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How to replace specific number in a file

 
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# 1  
Old 08-26-2010
How to replace specific number in a file
Hi,

i'm trying to find a way to replace some numbers in a file, but with no luck sofar.

Let's say i have file with three columns,
i would like to find specific line, and replace third column with different number.
Code:
search_string="oa11 /home/testfile1.log"
new_number=600

test file contains two lines with three columns
Code:
oa11 /home/testfile1.log 100
oa11 /home/testfile2.log 200

changed file would be:
Code:
oa11 /home/testfile1.log 600
oa11 /home/testfile2.log 200

Im think i can do this using sed, but no clue how
Thanks for any tips.
D.

Moderator's Comments:
Mod Comment Use code tags please, ty.
# 2  
Old 08-26-2010
Code:
awk '/oa11 \/home\/testfile1.log/{$3=600}1' file > newfile

# 3  
Old 08-26-2010
Code:
sed '/\/home\/testfile1.log/s/\(.*\) \(.*\)$/\1 600/' infile

# 4  
Old 08-26-2010
Code:
$ search_string="oa11 /home/testfile1.log"
$ new_number=600
$ awk -v s="$search_string" -v n=$new_number '{if (s==$1 FS $2) $3=n}1' infile

oa11 /home/testfile1.log 600
oa11 /home/testfile2.log 200

# 5  
Old 08-27-2010
Thanks for all your replies,
was really helpful for me
 
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