generating frequency table from file

Question

Given an input file containing one single number per line, how could I get a count of how many times an item occurred in that file?

cat input.txt
1
2
1
3
1
0
         


        

Answer 1

Using maphimbu from the Debian stda package:

# use 'jot' to generate 100 random numbers between 1 and 5
# and 'maphimbu' to print sorted "histogram":
jot -r 100 1 5 | maphimbu -s 1

Output:

             1                20
             2                21
             3                20
             4                21
             5                18

maphimbu also works with floating point:

jot -r 100.0 10 15 | numprocess /%10/ | maphimbu -s 1

Output:

             1                21
           1.1                17
           1.2                14
           1.3                18
           1.4                11
           1.5                19