[clock]
description = 'Returns an approximation of the amount in seconds of CPU time used by the program.'

[data]
description = 'Returns a string or a table containing date and time, formatted according to the given string `format`.'

[difftime]
description = 'Returns the difference, in seconds, from time `t1` to time `t2`.'

[execute]
description = 'Passes `command` to be executed by an operating system shell.'

[exit]
description = 'Calls the ISO C function `exit` to terminate the host program.'

[getenv]
description = 'Returns the value of the process environment variable `varname`.'

[remove]
description = 'Deletes the file with the given name.'

[rename]
description = 'Renames the file or directory named `oldname` to `newname`.'

[setlocale]
description = 'Sets the current locale of the program.'

[time]
description = 'Returns the current time when called without arguments, or a time representing the local date and time specified by the given table.'

[tmpname]
description = 'Returns a string with a file name that can be used for a temporary file.'