wc options files
|-c||Print character count|
|-l||Print line count|
|-w||Print word count|
This counts the number of characters or words.
$ who|wc 1 6 46 $ who|wc -l 1
In the first example output the who command is piped through to wc, and the following columns are displayed:
number of lines, number of words, number of characters
In the second example, wc just prints the number of lines.
$ VAR="tapedrive" echo $VAR | wc -c 10
The number of characters in the string VAR is output.