Table of Contents

1. Challenge

   Use Built-In Help and External Help Commands to Find Out More About a Given Command

   Get help for a command

   ls --help
   

   Output the help to a file so it can be searched

   ls --help > lshelp.txt
   

   Scroll through the file:

   less lshelp.txt
   

   Quit out of it by hitting q.

   Find out what will run with ls:

   which ls
   

   See if there are more on the system:

   which -a ls
   

   Find out more information about a command:

   whereis ls
   

   Find out what a command is:

   whatis crontab
   

2. Challenge

   Use the `man` Command and Related Utilities to Find Out More Information on Desired Commands

   man -f crontab
   

   This will show us the sections.

   man man
   

   There will be a table that shows us the section numbers. Quit out of it by hitting q.

   man -f crontab
   
   man 5 crontab
   

   This takes us to the configuration file format of crontab. Quit out of it by hitting q.

   If we don't know which one we want, enter:

   man -a crontab
   

   It will show us the first one. Quit by hitting q. if we want the next one. Hit Enter.

3. Challenge

   Investigate Additional Sources of Documentation on the System `tree`

   cd /usr/share/doc/packages
   

   Run the following:

   tree -H '/usr/share/doc/packages' -L 1 --noreport --charset utf-8 > ~/packages_index.html
   

   Note: If tree is not installed, you can install it by running sudo -i zypper in tree.