anchor.diff:  ====
   
   display default information on executable (or object file):
  -[source,bash]
  +----
   $ nm foo
  +----
   
   display all the symbols in an executable:
  -[source,bash]
  +----
   $ nm -n foo
  +----
   
   display information about the size of a particular symbol, bar:
  -[source,bash]
  +----
   $ nm -n foo -S | grep bar
  +----
   
   only display information on external symbols:
  -[source,bash]
  +----
   $ nm -g foo
  +----
   
   [index]
   == other utils
  
positive.code: ****
  */etc/fstab*
  ----
  # <file system> <mount point>   <type>  <options>     <dump> <pass>+
  # performs filesys check every 30 startups
  /dev/sda1        /mnt/foo        ext4   defaults 0 30   
  # filesys checks disabled
  
negative.code: *get basic file information on a file(s).*
  
  basic syntax:
  ----
  $ file file
  ----
  
  example:
  ----
  $ file foo
  
  