Quick demo of a Bash if statement that depends on how many filenames in the working directory match a string

Bash_if_grep_count

#!/bin/bash

# we want to know how many files in this directory contain the string 'bar'
number_of_matches=`ls | grep -c bar`

# uncomment the following line to see how many matches you got:
#echo $number_of_matches

# if only one match, let me know
if [[ $number_of_matches -eq 1 ]]
then
    echo "it's one"
else
    echo "it's not one"
fi