Status

• info exist varname

  if the variable varname exists in the current context then returns 1, otherwise returns 0.

• info path

  return current processing file name.

• info globals

  return a list of global variables.

• info locals

  return a list of all the names of currently-defined local variables, including arguments to the current procedure. Variables defined with the global and upvar commands will not be returned.

• info library

  return the path name of the library.

commands in the clock manipulate time and date.

• clock clicks

  return a high-resolution time value as a system-dependent integer value. The unit of the value is system-dependent but should be the highest resolution clock available on the system such as a CPU cycle counter. This value should only be used for the relative measurement of elapsed time.

• clock seconds

  return the current date and time as a system-dependent integer value. The unit of the value is seconds.

• clock format clockvalue [options]

  converts an integer time value, typically returned by clock seconds, clock scan options, to human-readable form. The options maybe format=string that describes how the date and time are to be formatted. Field descriptors consist of a % followed by a field descriptor character. All other characters are copied into the result. Valid field descriptors are: converts an integer time value, typically returned by clock seconds, clock scan options, to human-readable form.

  Without the format=string option, the format string "%a %b %d %H:%M: %S %Z %Y" is used. The gmt=true specifies that the time will be formatted as Greenwich Mean Time. The false value is the local timezone defined by the operating environment and it is a default value.

  Valid field descriptors are:

  %%  Insert a %.
  
  %a  Abbreviated weekday name (Mon, Tue, etc.). 
  %A  Full weekday name (Monday, Tuesday, etc.). 
  %b  Abbreviated month name (Jan, Feb, etc.). 
  %B  Full month name. 
  
  %c  Locale specific date and time. 
  
  %d  Day of month (01 - 31). 
  %H  Hour in 24-hour format (00 - 23). 
  %I  Hour in 12-hour format (00 - 12). 
  %j  Day of year (001 - 366). 
  %m  Month number (01 - 12). 
  %M  Minute (00 - 59). 
  %p  AM/PM indicator. 
  %S  Seconds (00 - 59). 
  %U  Week of year (01 - 52), Sunday is 
      the first day of the week. 
  %w  Weekday number (Sunday = 0). 
  %W  Week of year (01 - 52), Monday is 
      the first day of the week. 
  
  %x  Locale specific date format. 
  %X  Locale specific time format. 
  %y  Year without century (00 - 99). 
  %Y  Year with century (e.g. 1990) 
  
  %Z  Time zone name.