Script to add a single line to middle of text file.


 
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# 1  
Old 05-12-2008
Script to add a single line to middle of text file.

I've got a configuration file that is filled with xml text statements for example:

<...../>
<...../>
<...../>
<data id="java-options" value="-server -Djava.security.policy..../>
<...../>
<...../>
<...../>


I want to write a korn shell script that will go to this specific line and add a certain parameter as follows:


<data id="java-options" value="-server -My_Parameter -Djava.security.policy..../>

I'm thinking that I can do this with head and tail but I'm not sure how to do it. Any help help would be appreciated.
# 2  
Old 05-12-2008
head and tail cannot add any information on their own. For easy string replacements, you probably want sed.

Code:
sed -e '/<data /s/-server/& -My_Parameter/' file >file.new

This will search for "<data" and perform a substitution ("s") of "-server" with "-server -MyParameter" (the & is magical and means "whatever we are substituting") on that line. Other lines are printed unchanged.
# 3  
Old 05-12-2008
Quote:
Originally Posted by era
head and tail cannot add any information on their own. For easy string replacements, you probably want sed.

Code:
sed -e '/<data /s/-server/& -My_Parameter/' file >file.new

This will search for "<data" and perform a substitution ("s") of "-server" with "-server -MyParameter" (the & is magical and means "whatever we are substituting") on that line. Other lines are printed unchanged.
This works perfectly, thank you!
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