Sets the buffering mode for an output file. There are three available modes:
"no": no buffering; the result of any output operation appears immediately.
"full": full buffering; output operation is performed only when the buffer is full (or when you explicitly flush the file (see io.flush)).
"line": line buffering; output is buffered until a newline is output or there is any input from some special files (such as a terminal device).
For the last two cases, size specifies the size of the buffer, in bytes. The default is an appropriate size.
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file:write (···)
Writes the value of each of its arguments to the file. The arguments must be strings or numbers. To write other values, use tostring or string.format before write.
5.8 - Operating System Facilities
This library is implemented through table os.
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os.clock ()
Returns an approximation of the amount in seconds of CPU time used by the program.
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os.date ([format [, time]])
Returns a string or a table containing date and time, formatted according to the given string format.
If the time argument is present, this is the time to be formatted (see the os.time function for a description of this value). Otherwise, date formats the current time.
If format starts with '!', then the date is formatted in Coordinated Universal Time. After this optional character, if format is the string "*t", then date returns a table with the following fields: year (four digits), month (1--12), day (1--31), hour (0--23), min (0--59), sec (0--61), wday (weekday, Sunday is 1), yday (day of the year), and isdst (daylight saving flag, a boolean).
If format is not "*t", then date returns the date as a string, formatted according to the same rules as the C function strftime.
When called without arguments, date returns a reasonable date and time representation that depends on the host system and on the current locale (that is, os.date() is equivalent to os.date("%c")).
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os.difftime (t2, t1)
Returns the number of seconds from time t1 to time t2. In POSIX, Windows, and some other systems, this value is exactly t2-t1.
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os.execute ([command])
This function is equivalent to the C function system. It passes command to be executed by an operating system shell. It returns a status code, which is system-dependent. If command is absent, then it returns nonzero if a shell is available and zero otherwise.
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os.exit ([code])
Calls the C function exit, with an optional code, to terminate the host program. The default value for code is the success code.
5. Standard libraries
Start from the beginning
