sed replace


 
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# 1  
Old 06-19-2012
sed replace

Hi,

i have a file as give below

Code:
>cat sample_file
param1 val1 2012-06-19

##there can be one or more space after 2012-06-19 in the above file

i want to replace val1 with a with value passed through a variable...
below is the command i tried
Code:
>parval='param1 val2'
>par1=param1
>sed "s/$par1 ..* /$parval /g" < sample_file

param1 val2

ie, the whole line in the sample file is replaced (the date is removed) but i want only the param1 val1 to be replaced with the parval variable value

can anyone help me with a suitable sed command for this requirement
# 2  
Old 06-19-2012
If I understand your requirement properly, try

Code:
sed "s|$par1[ ]*[^ ]*|$parval|" sample_file


.* expression will always match the longest possible pattern...need to restrict the matched pattern.
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# 3  
Old 06-19-2012
this command is working ....thanks

can i know what does this mean
Code:
$par1[ ]*[^ ]*


Last edited by Scrutinizer; 06-19-2012 at 06:28 AM.. Reason: code tags
# 4  
Old 06-19-2012
Quote:
Originally Posted by midhun19
can i know what does this mean
$par1[ ]*[^ ]*
It means a pattern which has the value of "par1" followed by 0 or more spaces and 0 or more characters which are not space...
This User Gave Thanks to elixir_sinari For This Post:
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