proc limits {} {
  #
  Desc "Here you set up different limits, which you want your shell"\
      "to apply to your programs."
  ShortDesc "Limits"

  Entry cputime \
      -text "Maximum cpu time a process may use"\
      -width 10 \
      -packEntry:side right
  
  Entry filesize\
      -text "Largest single file allowed"\
      -width 10 \
      -packEntry:side right
  
  Entry datasize \
      -text "Maximum data size for the process (including stack)" \
      -width 10 \
      -packEntry:side right

  Entry stacksize \
      -text "Maximum stack size for the process"\
      -width 10 \
      -default 8192k \
      -packEntry:side right

  Entry coredumpsize \
      -text "Maximum size of a core dump file"\
      -default 0k \
      -width 10 \
      -packEntry:side right

  Int descriptors \
      -text "Maximum number of descriptors"\
      -default 64 \
      -packEntry:side right

  ################################ Help ################################
  Help cputime \
      "If a process takes more than this amount of cpu time, it will"\
      "stop.\n\n Format:\nblank - unlimited\nxxxh - xxx hours\nxxxm -"\
      "xxx minutes\nmm:ss - mm minutes and ss seconds."

  Help filesize\
      "This is the maximum size the shell allows a file to have\n\n"\
      "Format:\nblank - unlimited\nxxxk - xxx kilobytes\nxxxm - xxx"\
      "megabytes"

  Help datasize \
      "This is the maximum size a process may occupy in the memory of"\
      "the computer.\n\nFormat:\nblank - unlimited\nxxxk - xxx"\
      "kilobytes\nxxxm - xxx megabytes"

  Help stacksize \
      "This is the maximum size the stack may occupy in the memory of"\
      "the computer.  The stack is where variables of a function are"\
      "pushed when the function is called\n\nFormat:\nblank -"\
      "unlimited\nxxxk - xxx kilobytes\nxxxm - xxx megabytes"

  Help coredumpsize \
      "This is the maximum size of a core dump file allowed.  If you"\
      "don't use the core dumps for anything, it's a very good idea to"\
      "set this to zero, to avoid file system"\
      "overflow\n\nFormat:\nblank - unlimited\nxxxk - xxx"\
      "kilobytes\nxxxm - xxx megabytes"

  Help descriptors \
      "This is the maximum number of files which may be opened"\
      "simultaneously.\n\nFormat:\nblank - unlimited\nxxx - allow xxx"\
      "descriptors"
  
  ############################## Page End ##############################
  PageEnd {
    if {$cputime != "" && ![regexp {^[0-9]+[hm]$} $cputime]} {
      error "Wrong format for cputime, should be one of:\nblank - unlimited\nxxxh - xxx hours\nxxxm - xxx minutes"
    }
    foreach elm {filesize datasize stacksize coredumpsize} {
      if {[set $elm] != "" && ![regexp {^[0-9]+[km]$} [set $elm]]} {
        error "wrong format for $elm, should be one of:\nblank - unlimited\nxxxk - xxx kilibytes\nxxxm - xxx megabytes"
      }
    }
  }

  ################################ Save ################################
  Save {
    foreach elm {cputime filesize datasize stacksize
      coredumpsize descriptors} {
      if {[set $elm] != "" || $generateDefault} {
        if {[set $elm] == ""} {
          print "unlimit $elm"
        } else {
          print "limit $elm [set $elm]"
        }
      }
    }
  }
}