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Extract a pattern from file

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# 1  
Old 06-09-2010
Extract a pattern from file
In my file I have a pattern
ri="234"

value of ri can be any i want to find this pattern in file replace this value of ri with another value stored in some variable say newri

Please tell how to do it?

Thanks in Advance
# 2  
Old 06-09-2010
Maybe this Smilie
Code:
$ cat rifile
rg="333"
rh="222"
ri="234"
rj="567"
rk="890"
$ newri=777
$ sed -ie "s/^ri=.*/ri=\"$newri\"/" rifile
$ cat rifile
rg="333"
rh="222"
ri="777"
rj="567"
rk="890"
$

This User Gave Thanks to pseudocoder For This Post:
pasricha.kunal
# 3  
Old 06-09-2010
thanks for reply but in my file occurance is like

Code:
rg="333",rh="222",ri="234",rj="567",rk="890"

pls suggest a way
Last edited by Franklin52; 06-09-2010 at 07:44 AM.. Reason: Please use code tags!
# 4  
Old 06-09-2010
Try
Code:
sed -ie "s/ri=\"[0-9]*\"/ri=\"$newri\"/" rifile



---------- Post updated at 12:48 ---------- Previous update was at 12:45 ----------

Code:
$ newri=111
$ echo 'rg="333",rh="222",ri="234",rj="567",rk="890"' | sed  "s/ri=\"[0-9]*\"/ri=\"$newri\"/"
rg="333",rh="222",ri="111",rj="567",rk="890"
$

This User Gave Thanks to pseudocoder For This Post:
pasricha.kunal
# 5  
Old 06-09-2010
facing following error


Code:
sed: illegal option -- i
Usage:  sed [-n] script [file...]
sed [-n] [-e script]...[-f script_file]...[file...]

Last edited by Franklin52; 06-09-2010 at 08:34 AM..
# 6  
Old 06-09-2010
All right, looks like your version of sed does not support the so-called inplace editing.
No problem. Try
Code:
sed "s/ri=\"[0-9]*\"/ri=\"$newri\"/" input > output
mv output input

# 7  
Old 06-09-2010
now comes this error

Code:
sed: command garbled: s/ri="[0-9]*"/ri="

what i did is you can see below

Code:
sed  "s/ri=\"[0-9]*\"/ri=\"$newri\"/" $2 > output
mv output $2

Last edited by Franklin52; 06-09-2010 at 08:34 AM.. Reason: Please use code tags!
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