How to sort and get last value?


 
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# 1  
Old 02-05-2019
How to sort and get last value?

hi,
would you guys help me ?
i have a file with some list, and i want to sort the list and get last value.
ex: cat testing.csv
Code:
$ cat testing.csv
a,1
a,2
a,3
d,5
b,3
c,3
c,4
etc

i want to get value like this :
Code:
a,3
b,3
c,4
d,5

Moderator's Comments:
Mod Comment As per forum rules always wrap your samples/codes like [CODE]your samples[/CODE].

Last edited by RavinderSingh13; 02-06-2019 at 01:34 AM..
# 2  
Old 02-06-2019
if strings have only one digit and one letter
Code:
sort -rV file | rev | uniq -s2 | rev

--- Post updated at 04:56 ---

if strings have multiple numbers and letters
Code:
sort -rV file | sed -r 's/(.*),(.*)/\2 \1/' | uniq -f1 | sed -r 's/(.*) (.*)/\2,\1/'

--- Post updated at 05:01 ---

Code:
awk -F, '!t[$1]++' OFS="," <(sort -Vr file)

# 3  
Old 02-06-2019
hi,

Thank you so much for your reply, I tried all command that you suggested, only this one is work:
Code:
sort -rV file | rev | uniq -s2 | rev

but still I get duplicate value,
Code:
ex: cat testing.csv
a,1
a,2
a,3
d,5
b,3
c,3
c,4
etc

i get like this:
Code:
a,2
a,3
b,3
c,4
d5

#a still have two value 2 and 3.

would you help me again?

--- Post updated at 06:24 AM ---

Hello,

Thank you so much for your reply, I tried all command that you suggest,
only this one is work:
Code:
sort -rV file | rev | uniq -s2 | rev

but still i get duplicate value,
Code:
ex: cat testing.csv
a,1
a,2
a,3
d,5
b,3
c,3
c,4
etc

i get like this:

Code:
a,2
a,3
b,3
c,4
d5

#a still have two value 2 and 3.

would you help me again?

Moderator's Comments:
Mod Comment MOD's comments: Please wrap your samples/codes in to tags like [CODE]cat file etc etc[/CODE}.

Last edited by RavinderSingh13; 02-06-2019 at 02:34 AM..
# 4  
Old 02-06-2019
Moderator's Comments:
Mod Comment Ravinder's note moved to a user note for kivale. Please use user notes for these types of moderation comments.

Thanks. Neo
This User Gave Thanks to RavinderSingh13 For This Post:
# 5  
Old 02-06-2019
Smilie
Code:
sort -Vr testing.csv | sort -ut, -k1,1

I apologize, forgot to refresh the page, did not see the answer
This User Gave Thanks to nezabudka For This Post:
# 6  
Old 02-06-2019
Thank you so much Smilie
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