Question

Write an awk script that prints a list of all the words in an input file along with the number of times each word appears.

Answer 1

Please find the following awk script which counts the frequency of words from input file.

Program

#this awk script reads every line from input file and counts the frequency
#of it
awk '
{
for (i=1; i<=NF; i++) {
words[$i]++
}
}
END {
printf("Count Word\n----- ----\n")
for (w in words)
printf("%3d %s\n", words[w], w)
} ' $1

Sample Input File:

USER > cat input_words
This is a file with many words.
Some of the words appear more than once.
Some of the words only appear one time
rajini Rajni rajini dix

Sample Output

USER: ./count_words.sh input_words
Count Word
----- ----
1 dix
1 file
2 Some
1 time
1 with
1 once.
2 of
1 This
1 more
1 a
1 Rajni
2 words
1 words.
1 only
1 many
2 the
1 one
2 rajini
1 than
2 appear
1 is

./count_words.sh input words CountWord 1 dix file 2 Some 1 time 1 with once. of 1 This 1 more 1 Rajni 2 words 1 words. only 1 many 2 the one 2 rajini 1 than 2 appear