Count the number of files in a folder with wc
$ ls | wc -lwill display the number of files in the current directory (folder).
$ ls *.md | wc -lwill display the number of Markdown files in the current directory.
In these two examples, we use ls to list the content of the directory and then pipe (i.e. |) the output of ls to the command wc which will display number of lines as we invoke the option -l, short for --lines.
In the second example we tell ls to only list Markdown files using a wildcard (i.e. *) and the extension of Markdown files (i.e. .md).
To learn about wc run $ man wc.
wc was first released in 19711. It is now part of the coreutils package which is copyleft-licensed and is maintained by Jim Meyering2
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