wc (short for word count) is a command line tool in Unix/Linux operating systems, which is used to find out the number of newline count, word count, byte and character count in the files specified by the File arguments to the standard output and hold a total count for all named files.
When you define the File parameter, the wc command prints the file names as well as the requested counts. If you do not define a file name for the File parameter, it prints only the total count to the standard output.
In this article, we will discuss how to use the wc command to calculate a file’s newlines, words, characters, or byte count with practical examples.
wc Command Syntax
The syntax of the wc command is shown below.
# wc [options] filenames
The followings are the options and usage provided by the wc command.
wc -l– Prints the number of lines in a file.wc -w– prints the number of words in a file.wc -c– Displays the count of bytes in a file.wc -m– prints the count of characters from a file.wc -L– prints only the length of the longest line in a file.
Let’s see how we can use the ‘wc‘ command with the few available arguments and examples in this article. We have used the ‘tecmint.txt‘ file for testing the commands.
Let’s find out the output of the tecmint.txt file using the cat command as shown below.
$ cat tecmint.txt Red Hat CentOS AlmaLinux Rocky Linux Fedora Debian Scientific Linux OpenSuse Ubuntu Xubuntu Linux Mint Deepin Linux Slackware Mandriva
1. A Basic Example of WC Command
The ‘wc‘ command without passing any parameter will display a basic result of the ‘tecmint.txt‘ file. The three numbers shown below are 12 (number of lines), 16 (number of words), and 112 (number of bytes) of the file.
$ wc tecmint.txt 12 16 112 tecmint.txt
2. Count Number of Lines in a File
Count the number of newlines in a file using the option ‘-l‘, which prints the number of lines from a given file. Say, the following command will display the count of newlines in a file.
In the output, the first field is assigned as count and the second field is the name of the file.
$ wc -l tecmint.txt 12 tecmint.txt
3. Count Number of Words in a File
The -w argument with the wc command prints the number of words in a file. Type the following command to count the words in a file.
$ wc -w tecmint.txt 16 tecmint.txt
4. Count Number of Characters in a File
When using option -m with the wc command will print the total number of characters in a file.
$ wc -m tecmint.txt 112 tecmint.txt
5. Count Number of Bytes in a File
When using option -c will print the number of bytes of a file.
$ wc -c tecmint.txt 112 tecmint.txt
6. Display Length of Longest Line in File
The ‘wc‘ command allows an argument ‘-L‘, it can be used to print out the length of the longest (number of characters) line in a file.
So, we have the longest character line (‘Scientific Linux‘) in a file.
$ wc -L tecmint.txt 16 tecmint.txt
7. Check wc Command Options
For more information and help on the wc command, simply run the ‘wc --help‘ or ‘man wc‘ from the command line.
$ wc --help OR $ man wc
Usage: wc [OPTION]... [FILE]...
or: wc [OPTION]... --files0-from=F
Print newline, word, and byte counts for each FILE, and a total line if
more than one FILE is specified. A word is a non-zero-length sequence of
characters delimited by white space.
With no FILE, or when FILE is -, read standard input.
The options below may be used to select which counts are printed, always in
the following order: newline, word, character, byte, maximum line length.
-c, --bytes print the byte counts
-m, --chars print the character counts
-l, --lines print the newline counts
--files0-from=F read input from the files specified by
NUL-terminated names in file F;
If F is - then read names from standard input
-L, --max-line-length print the maximum display width
-w, --words print the word counts
--help display this help and exit
--version output version information and exit
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Full documentation at: <https://www.gnu.org/software/coreutils/wc>
or available locally via: info '(coreutils) wc invocation'
In this article, you’ve learned about the wc command, which is a simple command-line utility to count the number of lines, words, characters, and byes in text files. There are lots of such other Linux commands, you should learn and master your command-line skills.