wc

The wc (word count) command prints the number of newlines, words, and bytes for each given file. If multiple files are specified, it also prints a total line.

Basic Syntax

wc [OPTION]... [FILE]...

Common Options

Option	Description
-l, --lines	Print the newline counts.
-w, --words	Print the word counts.
-c, --bytes	Print the byte counts.
-m, --chars	Print the character counts.

Real-world Examples

1. Count lines, words, and bytes in a file:

   wc document.txt

2. Count only the number of lines:

   wc -l file.txt

3. Count the number of files in a directory:

   ls -1 | wc -l

4. Count words in a string using standard input:

   echo "Hello world" | wc -w