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 Change Subfolders Permission Only, keep all files untouched
to add read permission for group and others on all subdirs in the current directory:
  $ find * -maxdepth 1 -type d | xargs chmod go+r
comment:
-maxdepth, is the depth from current dirctory find command looks for
-type, type of objects find command is looking for
xargs, get outputs from find command