To find number of occurrences of a word taken as input from command line in unix

Question

For the file file1.txt which contains

Apple fruit Apple tree
Tree AApple AApklle Apple apple
TREE
Apple

I want to find number of o

Answer 1

One in awk:

$ awk -v w="Apple" 'BEGIN{RS="( |\n)+"}{c+=($1==w)}END{print c}' file
4

Explained:

$ awk -v w="Apple" '     # search word as parameter
BEGIN {
    RS="( |\n)+"         # set record separator to separate words
    # RS="[[:space:]]+"  # where available
}{
    c+=($1==w)           # count searched words
}
END {                    # in the end
   print c+0             # output count
}' file

RS="( |\n)+" is tested to work on gawk, mawk and Busybox awk, it failed to work on Debian's original-awk. RS="[[:space:]]+" tested to work on gawk only.