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04-19-2017, 07:46 AM
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#1
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Member
Registered: Apr 2017
Posts: 33
Rep: 
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How to replace "-\n>" to "->" in linux using sed
Hi,
I would like to do the following:
to
I would like to replace "\n" between "-" and ">" to be replaced by none.
As I have other "\n" that should be unchanged.
Thanks!
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04-19-2017, 08:03 AM
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#2
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LQ Veteran
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 21,440
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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.
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04-19-2017, 08:23 AM
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#3
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Member
Registered: Apr 2017
Posts: 33
Original Poster
Rep: 
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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.
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04-19-2017, 08:34 AM
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#4
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LQ Guru
Registered: Apr 2005
Distribution: Linux Mint, Devuan, OpenBSD
Posts: 7,756
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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.
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2 members found this post helpful.
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04-19-2017, 08:46 AM
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#5
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Member
Registered: Apr 2017
Posts: 33
Original Poster
Rep: 
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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) 
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04-19-2017, 08:27 PM
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#6
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LQ Veteran
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 21,440
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Quote:
Originally Posted by Asoo
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.
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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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1 members found this post helpful.
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