BRO-CUT(1)

NAME
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 field names 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 in the output.

-C  Include all format header blocks in 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 character.

-h  Show help.

-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"

Compressed logs must be uncompressed with another utility:
zcat conn.log.gz | bro-cut

SEE ALSO
strftime(3)

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