lfs-book-zh_CN/bootscripts/lfs/init.d/consolelog

#!/bin/sh
########################################################################
# Begin consolelog
#
# Description : Set the kernel log level for the console
#
# Authors     : Dan Nicholson - dnicholson@linuxfromscratch.org
#               Gerard Beekmans  - gerard@linuxfromscratch.org
#               DJ Lucas - dj@linuxfromscratch.org
# Update      : Bruce Dubbs - bdubbs@linuxfromscratch.org
#
# Version     : LFS 7.0
#
# Notes       : /proc must be mounted before this can run
#
########################################################################

### BEGIN INIT INFO
# Provides:            consolelog
# Required-Start:
# Should-Start:        
# Required-Stop:
# Should-Stop:
# Default-Start:       S
# Default-Stop:
# Short-Description:   Sets the console log level.
# Description:         Sets the console log level.
# X-LFS-Provided-By:   LFS
### END INIT INFO

. /lib/lsb/init-functions

# set the default loglevel if needed
LOGLEVEL=${LOGLEVEL:-7}

[ -r /etc/sysconfig/console ] && . /etc/sysconfig/console

case "${1}" in
   start)
      case "$LOGLEVEL" in
      [1-8])
         log_info_msg "Setting the console log level to ${LOGLEVEL}..."
         dmesg -n $LOGLEVEL
         evaluate_retval
         exit 0
         ;;

      *)
         log_failure_msg "Console log level '${LOGLEVEL}' is invalid"
         exit 1
         ;;
      
      esac
      ;;

   status)
      # Read the current value if possible
      if [ -r /proc/sys/kernel/printk ]; then
         read level line < /proc/sys/kernel/printk
      else
         log_failure_msg "Can't read the current console log level"
         exit 1
      fi

      # Print the value
      if [ -n "$level" ]; then
         log_info_msg "The current console log level is ${level}\n"
         exit 0
      fi
      ;;

   *)
      echo "Usage: ${0} {start|status}"
      exit 1
      ;;
esac

# End consolelog