time: Redirecting
1.3 Redirecting Output
======================
By default, 'time' writes the resource use statistics to the standard
error stream. The options below make it write the statistics to a file
instead. Doing this can be useful if the program you're running writes
to the standard error or you're running 'time' noninteractively or in
the background.
'-o FILE'
'--output=FILE'
Write the resource use statistics to FILE. By default, this
_overwrites_ the file, destroying the file's previous contents.
'-a'
'--append'
_Append_ the resource use information to the output file instead of
overwriting it. This option is only useful with the '-o' or
'--output' option.