wc – Count & Print the No. of Bytes,Words & Lines in files.
Print byte, word, and newline counts for each FILE, and a total line if more than one FILE is specified. With no FILE, or when FILE is -, read stdin.
$ wc — Accept the input from stdio and count
$ wc myfile — Print the no .of bytes, words, lines in the file.
$ wc -l myfile — Print the newline counts only
$ wc -w myfile — Print the words count only
$ wc -c myfile — Print the bytes count only
$ wc -L myfile — Print the length of the longest line
$ wc f1 f2 f3 — Print the no .of bytes, words, lines in each file and also print the total.
$ ls -1 | wc -l — Print the total no .of files present in the dir
Read : man wc