The first main boot script is the /etc/init.d/rc script. Create the /etc/init.d/rc script by running the following command:
cat > /etc/init.d/rc << "EOF" #!/bin/sh # Begin /etc/init.d/rc # # By Jason Pearce - [email protected] # Modified by Gerard Beekmans - [email protected] # print_error_msg based on ideas by Simon Perreault - # [email protected] # # # Include the functions declared in the /etc/init.d/functions file # source /etc/init.d/functions # # The print_error_msg function prints an error message when an unforeseen # error occurred that wasn't trapped for some reason by a evaluate_retval # call or error checking in different ways. print_error_msg() { echo $FAILURE echo -n "You should not read this error message. It means " echo "that an unforeseen error " echo -n "took place and subscript $i exited with " echo "a return value " echo -n "of $error_value for an unknown reason. If you're able " echo "to trace this error down " echo -n "to a bug in one of the files provided by this book, " echo "please be so kind to " echo -n "inform us at [email protected]" $NORMAL echo echo echo "Press a key to continue..." read } # # If you uncomment the debug variable below none of the scripts will be # executed, just the script name and parameters will be echo'ed to the # screen so you can see how the scripts are called by rc. # # Un-comment the following for debugging. # debug=echo # # Start script or program. # startup() { $debug "$@" } # # Ignore CTRL-C only in this shell, so we can interrupt subprocesses. # trap ":" INT QUIT TSTP # # Now find out what the current and what the previous runlevel are. The # $RUNLEVEL variable is set by init for all it's children. This script # runs as a child of init. # runlevel=$RUNLEVEL # # Get first argument. Set new runlevel to this argument. If no runlevel # was passed to this script we won't change runlevels. # [ "$1" != "" ] && runlevel=$1 if [ "$runlevel" = "" ] then echo "Usage: $0 <runlevel>" >&2 exit 1 fi # # The same goes for $PREVLEVEL (see above for $RUNLEVEL). previous will # be set to the previous run level. If $PREVLEVEL is not set it means # that there is no previous runlevel and we'll set previous to N. # previous=$PREVLEVEL [ "$previous" = "" ] && previous=N export runlevel previous # # Is there an rc directory for the new runlevel? # if [ -d /etc/rc$runlevel.d ] then # # If so, first collect all the K* scripts in the new run level. # if [ $previous != N ] then for i in /etc/rc$runlevel.d/K* do [ ! -f $i ] && continue # # the suffix variable will contain the script name without the leading # Kxxx # suffix=${i#/etc/rc$runlevel.d/K[0-9][0-9][0-9]} # # If there is a start script for this K script in the previous runlevel # determine what it's full path is # previous_start=/etc/rc$previous.d/S[0-9][0-9][0-9]$suffix # # If there was no previous run level it could be that something was # started in rcS.d (sysinit level) so we'll determine the path for that # possibility as well. # sysinit_start=/etc/rcS.d/S[0-9][0-9][0-9]$suffix # # Stop the service if there is a start script in the previous run level # or in the sysinit level. If previous_start or sysinit_start do not # exist the 'continue' command is run which causes the script to abort # this iteration of the for loop and continue with the next iteration. # This boils down to that it won't run the commands after the next two # lines and start over from the top of this for loop. See man bash for # more info on this. # [ ! -f $previous_start ] && [ ! -f $sysinit_start ] && continue # # If we found previous_start or sysinit_start, run the K script # startup $i stop error_value=$? # # If the return value of the script is not 0, something went wrong with # error checking inside the script. the print_error_msg function will be # called and the message plus the return value of the K script will be # printed to the screen # if [ $error_value != 0 ] then print_error_msg fi done fi # # Now run the START scripts for this runlevel. # for i in /etc/rc$runlevel.d/S* do [ ! -f $i ] && continue if [ $previous != N ] then # # Find start script in previous runlevel and stop script in this # runlevel. # suffix=${i#/etc/rc$runlevel.d/S[0-9][0-9][0-9]} stop=/etc/rc$runlevel.d/K[0-9][0-9][0-9]$suffix previous_start=/etc/rc$previous.d/S[0-9][0-9][0-9]$suffix # # If there is a start script in the previous level and no stop script in # this level, we don't have to re-start the service; abort this # iteration and start the next one. # [ -f $previous_start ] && [ ! -f $stop ] && continue fi case "$runlevel" in 0|6) # # levels 0 and 6 are halt and reboot levels. We don't really start # anything here so we call with the 'stop' parameter # startup $i stop error_value=$? # # If the return value of the script is not 0, something went wrong with # error checking inside the script. the print_error_msg function will be # called and the message plus the return value of the K script will be # printed to the screen # if [ $error_value != 0 ] then print_error_msg fi ;; *) startup $i start error_value=$? # # If the return value of the script is not 0, something went wrong with # error checking inside the script. the print_error_msg function will be # called and the message plus the return value of the K script will be # printed to the screen # if [ $error_value != 0 ] then print_error_msg fi ;; esac done fi # End /etc/init.d/rc EOF