less – command displays text files (with the possibility of searching through back).
less [options] file_name
-? displays a list of commands that can use less.
-p displays the text of the first line, which is found in the text.
-s compresses several blank lines to one blank line.
The less command displays mentioned files. In contrast to the more, the file can flipping back using the keys <b> <Ctrl+b> or <Esc+V>. To view the control command less press <h>.