Grep: count number of matches per line

grep -o -n '[{}]' <filename> | cut -d : -f 1 | uniq -c

The output will be something like:

3 1
1 2

Meaning 3 occurrences in the first line and 1 in the second.

Taken from https://stackoverflow.com/a/15366097/3378354 .

After reading various solutions, I think this is the easiest approach to the problem:

while read i; do echo $i |grep -o "matchingString"| wc -l;  done < input.txt

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