execute a command as another user

list directory contents

-1     list one file per line

-d, --directory
       list directory entries instead of contents, and do not dereference symbolic links

List information about the FILEs (the current directory by default).  Sort entries alphabetically if none
of -cftuvSUX nor --sort is specified.

-I, --ignore=PATTERN
       do not list implied entries matching shell PATTERN

-s, --size
       print the allocated size of each file, in blocks

-h, --human-readable
       with -l, print sizes in human readable format (e.g., 1K 234M 2G)