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Combine Similar Output from the 2nd field w.r.t 1st Field

 
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# 1  
Old 04-28-2016
Combine Similar Output from the 2nd field w.r.t 1st Field
Hi,

For example:

I have:

Code:
HostA,XYZ
HostB,XYZ
HostC,ABC

I would like the output to be:

Code:
HostA,HostB: XYZ
HostC:ABC

How can I achieve this?

So far what I though of is:
1. Look through 2nd field and
Code:
sort

and
Code:
uniq

it
2. Use what I have from 1. and
Code:
grep

the first field.
3. Get the first field I got from
Code:
grep

and group them by
Code:
comma

# 2  
Old 04-28-2016
I dont really understand your approach, but this
Code:
awk -F, '{T[$2] = T[$2] FS $1} END {for (t in T) print substr (T[t],2), t}' OFS=: file
HostA,HostB:XYZ
HostC:ABC

will turn your input sample into the desired output (uncertain if you want spaces in it or not).
This User Gave Thanks to RudiC For This Post:
alvinoo
 
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