"less"

If you are using linux from command line and you want to look at what your current folder includes. You type the command below:

ls

and press enter. If there is so much file or folder in this current folder and if you strall around in the folder you should enter the command below:

ls | less

and press enter. This will allow you to strall around the folder.

In the "less" mode you can search by with "/".
For example, you want to search for the word "apple" in your current folder, type what is written below:

/apple

and press enter. The words which includes "apple" will be highlighted.

<space> means "page down"
<q> will quit