How to append to the end of each line?

Question

I have this file, ipaddresses.txt

152.48.64.13
146.112.164.43
236.157.219.229
188.201.225.93
193.140.79.73
...

And this file, cidr.txt

And I want the output file to be like this:

152.48.64.13/20
146.112.164.43/21
236.157.219.229/8
188.201.225.93/20
193.140.79.73/21
...

How to achieve this?

Why sed, specifically? have you considered alternatives - such as paste -d/ ipaddresses.txt cidr.txt ? — steeldriver, Jul 21, 2019 at 23:01
Because I only know sed to do this kind of task, I will edit my thread. By the way, I tried using paste, it doesn't append to the last line, but it append a new line each. — annahri, Jul 21, 2019 at 23:14
@Annahri The paste command by steeldriver works. Do you not have GNU paste or is there something with your environment such as an alias? — Nasir Riley, Jul 21, 2019 at 23:36
@NasirRiley I'm using bash on Ubuntu on Windows 10 (what is the correct term for this?) I did paste -d/ ipaddresses.txt cidr.txt > out.txt. When I try to do it without outputting a file, It prints a different behaviour. It adds \ in the beginning of each line but It does correctly for the very last line. Hmm — annahri, Jul 21, 2019 at 23:53
@Annahri do your files have Windows style (CRLF) line endings by any chance? — steeldriver, Jul 21, 2019 at 23:54

ilkkachu · Accepted Answer · 2019-07-22 08:35:43Z

2

You want to use paste:

$ paste -d '/' ipaddresses.txt cidr.txt
152.48.64.13/20
146.112.164.43/21
236.157.219.229/8
188.201.225.93/20
193.140.79.73/21
.../...

answered Jul 22, 2019 at 8:35

ilkkachu

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