The wc (Word count) program prints a count of bytes,words,and lines in (presumably) a text file.
Very useful command on linux.
Here is the exmaples:
1. Default output
3746 3746 403618 test.lst
The test.lst file has 3746 lines, 3746 whitespace-delimited words and 403618 bytes.
2. -w option, prints words counts
wc -w test.lst
3. -c option, prints byte counts
wc -c test.lst
4. -l option, prints line counts
wc -l test.lst
5. -L Locate the longest line in the file and print its length in bytes
wc -L test.lst
6. prints result from stand input
I love dog 0 3 10 -
In the example above, type "I love dog" to standard input.
It is equivalent to the following result
echo -n "I love dog"| wc
0 3 10
Note: -n option is important in the above case.