Search Results

# cat file
ABCDDEBFGFDDSD
BBBBZYZWWDILSAASAA
BBBBZYZWWDILSAASAA

try search "B" ...
# sed 's/[^B]//g' file|sed ':a;$!N;s/\n//;ta'|sed -e 's/B/&\n/g'|sed -ne '/^$/!p'|sed -n '$='
10
# awk...

$ cat sample1.txt
ABCDEFAB ASK SDFKJDF

$ cat sample1.txt | sed s/./\&~/g | tr "~" "\n" | grep "B" | wc -l
2

Try this in directory containing those thousands of files: perl -n0e '@n=/B/g;print "$ARGV ",$#n+1,"\n"' * | sort -rnk2 > result