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sed appending needed only after first instance

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# 8  
Old 02-15-2011
Quote:
Originally Posted by yinyuemi
Code:
sed '0,/<falsemodule-option>/ {
/<falsemodule-option>/a\<LdapLogin>
}' file

awk is also a good way to try:

Code:
awk '/<falsemodule-option>/{p++} /<falsemodule-option>/ && p==1 {$0= $0"\n<LdapLogin>"}1'

Looks like only awk can help me in this scenario.
This helped me. now i would like to have some text written before the pattern.
Well, please can you tell me the syntax to write the text before the pattern that i am searching for ?

Thanks.

---------- Post updated at 01:38 PM ---------- Previous update was at 01:34 PM ----------

Quote:
Originally Posted by yinyuemi
Code:
sed '0,/<falsemodule-option>/ {
/<falsemodule-option>/a\<LdapLogin>
}' file

awk is also a good way to try:

Code:
awk '/<falsemodule-option>/{p++} /<falsemodule-option>/ && p==1 {$0= $0"\n<LdapLogin>"}1'

Looks like only awk can help me in this scenario.
This helped me. now i would like to have some text written before the pattern.
Well, please can you tell me the syntax to write the text before the pattern that i am searching for ?

Thanks.
# 9  
Old 02-15-2011
Code:
awk '/<falsemodule-option>/{p++} /<falsemodule-option>/ && p==1 {$0="<LdapLogin>\n"$0}1'

This User Gave Thanks to yinyuemi For This Post:
sunrexstar
# 10  
Old 02-15-2011
You can do it using sed:
Code:
sed '1,/<falsemodule-option>/s/<falsemodule-option>/<LdapLogin>/' input_file

# 11  
Old 02-16-2011
Quote:
Originally Posted by Shell_Life
You can do it using sed:
Code:
sed '1,/<falsemodule-option>/s/<falsemodule-option>/<LdapLogin>/' input_file

I tried but it is doing the job of replacing rather than inserting a line before the pattern.

---------- Post updated at 03:35 AM ---------- Previous update was at 03:34 AM ----------

Quote:
Originally Posted by yinyuemi
Code:
awk '/<falsemodule-option>/{p++} /<falsemodule-option>/ && p==1 {$0="<LdapLogin>\n"$0}1'



Thanks. do we have a '-i' flag like we have in sed which allows the changes to take right on the file upon execution.
I want the changes to be done on the file directly and not on the STDOUT
something like for example
Code:
sed -i '/pattern/a\text' FILE
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