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(time.info)Redirecting

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Redirecting Output
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   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.