Filter unique values from third column, separated by space

cat datax.log |  awk -F ' ' '/IMEI/{print $3}' | sort | uniq | wc -l

Filter unique values from third column, separated by :

cat datax.log |  awk -F ':' '/IMEI/{print $3}' | sort | uniq | wc -l

Search for text in files recursively

cd startFolder
grep -H "textToSearch" * -R