list directory contents

-l     (The  letter  ell.) Do not follow symbolic links named as operands unless the -H or -L options are
       specified. Write out in long format (see the STDOUT section). When -l (ell) is specified, -1 (one)
       shall be assumed.

-i     For each file, write the file's file serial number (see stat() in the System Interfaces volume  of
       IEEE Std 1003.1-2001).

-s     Indicate the total number of file system blocks consumed by each file displayed. The block size is
       implementation-defined.

-a     Write out all directory entries, including those whose names begin with a period ( '.' ).  Entries
       beginning  with  a  period shall not be written out unless explicitly referenced, the -a option is
       supplied, or an implementation-defined condition shall cause them to be written.