Linux 2.6 - man page for bootlogd (linux section 8)
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BOOTLOGD(8) Linux System Administrator's Manual BOOTLOGD(8)
bootlogd - record boot messages
/sbin/bootlogd [-c] [-d] [-r] [-s] [-v] [ -l logfile ] [ -p pidfile ]
Bootlogd runs in the background and copies all strings sent to the /dev/console device to
a logfile. If the logfile is not accessible, the messages will be kept in memory until it
-d Do not fork and run in the background.
-c Attempt to write to the logfile even if it does not yet exist. Without this
option, bootlogd will wait for the logfile to appear before attempting to write to
it. This behavior prevents bootlogd from creating logfiles under mount points.
-r If there is an existing logfile called logfile rename it to logfile~ unless log-
file~ already exists.
-s Ensure that the data is written to the file after each line by calling fdata-
sync(3). This will slow down a fsck(8) process running in parallel.
-v Show version.
Log to this logfile. The default is /var/log/boot.
Put process-id in this file. The default is no pidfile.
Bootlogd works by redirecting the console output from the console device. (Consequently
bootlogd requires PTY support in the kernel configuration.) It copies that output to the
real console device and to a log file. There is no standard way of ascertaining the real
console device if you have a new-style /dev/console device (major 5, minor 1) so bootlogd
parses the kernel command line looking for console=... lines and deduces the real console
device from that. If that syntax is ever changed by the kernel, or a console type is used
that bootlogd does not know about then bootlogd will not work.
Miquel van Smoorenburg, email@example.com
Jul 21, 2003 BOOTLOGD(8)
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