bro-cut man page

bro-cut — parse Bro logs

Synopsis

bro-cut [options] [columns]

Description

Extracts the given columns from ASCII Bro logs on standard input, and outputs them to standard output. If no columns are given, all are selected. By default, bro-cut does not include format header blocks in the output.

Columns are specified as a list of space-separated field names. The order of field names given to bro-cut determines the output order, which means bro-cut can be used to reorder columns.

The ASCII Bro logs read on standard input must have intact format header blocks because bro-cut needs this information to correctly interpret the log file format. In fact, bro-cut can process the concatenation of multiple ASCII log files that have different column layouts.

Options

-c
Include the first format header block into the output.
-C
Include all format header blocks into the output.
-d
Convert time values into human-readable format.
-D <fmt> Like -d
, but specify format for time (see strftime(3) for syntax).

-F <ofs> Sets a different output field separator.

-n
Print all fields except those specified.
-u
Like -d, but print timestamps in UTC instead of local time.
-U <fmt> Like -D
, but print timestamps in UTC instead of local time.

Environment

BRO_CUT_TIMEFMT
For time conversion option -d or -u, the format string can be specified by setting this environment variable.

Examples

Output three columns and convert time values:
cat conn.log | bro-cut -d ts id.orig_h id.orig_p

Output all columns and convert time values with a custom format string:
cat conn.log | bro-cut -D "%Y-%m-%d %H:%M:%S"

See Also

strftime(3)

Author

bro-cut was written by The Bro Project <info@bro.org>.

Info

November 2014 bro-cut User Commands