# log command

## Syntax

    log file keyword

-   file = name of new logfile
-   keyword = *append* if output should be appended to logfile
    (optional)

## Examples

``` LAMMPS
log log.equil
log log.equil append
```

## Description

This command closes the current LAMMPS log file, opens a new file with
the specified name, and begins logging information to it. If the
specified file name is *none*, then no new log file is opened. If the
optional keyword *append* is specified, then output will be appended to
an existing log file, instead of overwriting it.

If multiple processor partitions are being used, the file name should be
a variable, so that different processors do not attempt to write to the
same log file.

The file \"log.lammps\" is the default log file for a LAMMPS run. The
name of the initial log file can also be set by the [-log command-line
switch](Run_options).

## Restrictions

> none

## Related commands

none

## Default

The default LAMMPS log file is named log.lammps