Basic Linux Commands -Part 3

 cal :        Display a calendar

Syntax:

                        cal [-mjy] [[month] year]

Options:

           -m         Display monday as the first day of the week.

            -j          Display julian dates (days one-based,numbered from Jan 1

           -y          Display a calendar for the current year.

 chgrp :   Change group ownership

Syntax :

                 chgrp [Options]... {Group | --reference=File} File...

Key :

          -c

          --changes

                    Verbosely describe the action for each File whose group actually changes.

          -f

         --silent

         --quiet

                   Do not print error messages about files whose group cannot be changed.

         -f

         --no-dereference

                   Act on symbolic links themselves instead of what they point to.

         --reference=FILE

                  Use the group of the reference FILE instead of an explicit GROUP.

         -v

        --verbose

                 Verbosely describe the action or non-action taken for every File.

       -R

       --recursive

                Recursively change the group ownership of directories and their contents.