getpwuid

getpwuid uid

• Retrieves the passwd file entry with the user ID uid. The return value in list context is:
  
  

  ($name,$passwd,$uid,$gid,$quota,$comment,$gcos,$dir,$shell)
  

  
  
  If you want to do this repeatedly, consider slurping the data into a hash using getpwent.

  In scalar context, getpwuid returns the username.