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Old 04-19-2017, 07:46 AM   #1
Asoo
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How to replace "-\n>" to "->" in linux using sed


Hi,

I would like to do the following:

Code:
123456-
>123456
to

Code:
123456->123456
I would like to replace "\n" between "-" and ">" to be replaced by none.

As I have other "\n" that should be unchanged.

Thanks!
 
Old 04-19-2017, 08:03 AM   #2
syg00
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And your attempts have been what ?. If you've made no effort, why should we do it for you ?.
sed has the commands to do this - well documented.
 
Old 04-19-2017, 08:23 AM   #3
Asoo
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I have done few attempts. But I didn't wrote it here because none of it worked.

I wrote this (which are obviously not correct):

head abc.txt | sed 's/-\n\>/-\>/g'

head abc.txt | sed 's/-\n>/->/g'

head abc.txt | sed 's/-\\n\>/-\>/g'

I am confused because when I wanted to enter "\n" between line, it is done quite easily by replacing ">" to ">\n" but reverse of it doesn't apply. That's why I am stuck.
 
Old 04-19-2017, 08:34 AM   #4
Turbocapitalist
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It's tricky to get at the new line. Based on the small sample you gave, you could do it by checking for a dash at the end of each line and then, if one is found, appending the next line of input before doing the substitution.

Code:
sed -e '/-$/{ N; s/\n//; }' abc.txt
The /-$/ looks for a dash at the end of a line, then if one is found the N and s/// commands are executed.

Code:
man sed
 
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Old 04-19-2017, 08:46 AM   #5
Asoo
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Thank you so much for the reply!

Yes, it worked. Thanks for the link of manual. (I was also reading it)
 
Old 04-19-2017, 08:27 PM   #6
syg00
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Quote:
Originally Posted by Asoo View Post
I am confused because when I wanted to enter "\n" between line, it is done quite easily by replacing ">" to ">\n" but reverse of it doesn't apply. That's why I am stuck.
sed is stream oriented, so it gives you a record at a time - up to, but not including, the newline. Hence your problems. The solution provided is a simple way to overcome this if the data structure is known in advance.
 
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