Count common elements in a column


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# 1  
Count common elements in a column

HI, I have a 3-column tab separated column (approx 1GB) in which I would like to count and output the frequency of all of the common elements in the 1st column.
For instance:
If my input was the following:

Code:
dot is-big 2
dot is-round 3
dot is-gray 4
cat is-big 3
hot in-summer 5

My desired output would be the following:
Code:
dot 3
cat 1
hot 1


How can I do this with `wc` or `grep`?
# 2  
Code:
$ cut -d' ' -f1 file | sort | uniq -c
      1 cat
      3 dot
      1 hot

Code:
$ awk '{A[$1]++}END{for(i in A)print i,A[i]}' file
hot 1
cat 1
dot 3

# 3  
Code:
awk '{ print $1}' <filename>| uniq -c

# 4  
How about awk?

Code:
awk '{a[$1]++} END {for (i in a) { print i OFS a[i] }}' file


EDIT: If you have a lot of different values then you might run into memory issues with that (which zozoo's solution should avoid).
# 5  
@zozoo :

You should sort before using uniq, in current example it's fine, but in some cases there will be chances of printing duplicates.
This User Gave Thanks to Akshay Hegde For This Post:
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