init 4: need to change "chkconfig" entry

[daFranze]

Hi there,

we decided to change the default runlevel to 4, in runlevel 4 starts an additional software

since some scripts in /etc/init.d do stop software in Runlevel 4 I need to change the configuration in the files using the chkconfig entry from
# chkconfig: 235 77 99
to
# chkconfig: 2345 77 99
and re-register the scripts with chkconfig --del and chkconfig --add.

Therefore I intend to write a script, which checks the field 2, if it contains a 3 it would substitue it by 34.
Well I could write a very dowdy script, which heads and tails the file and cut the chkconfig into pieces to substitute the entry, BUT, is there an awk/perl/sed wizzard, which may write this in a single line?





Best Regards, Franz
--
System Manager (Solaris, HP-UX, Linux, some networking, some SAN)

 

[daFranze]

Any idea to do this more gorgeous?

#!/bin/sh

scriptname=$(basename $0)
theFile=$1

if [ -r $theFile ]; then
# lines = length of file
lines=$(cat $theFile | wc -l)

# chkline = line containing expected string chkconfig:
chkline=$(cat $theFile | sed 's:^:#:' | nl | grep chkconfig: | awk '{ print $1 }')

# headlines = lines in file over chkconfig: line
headlines=$(echo $chkline - 1 | bc)

# taillines = lines in file under chkconfig: line
taillines=$(echo $lines - $chkline | bc)

# make backup of file (we will read from this file furtheron
cp $theFile ${theFile}.old

# copy the lines above the chkconfig: line
head -${headlines} ${theFile}.old > ${theFile}

# this is not nice but it works...
# this is the replacement part: read the chkconfig:, cut into pieces and rebuild the line
newrunlevels=$(grep chkconfig ${theFile}.old | awk '{ print $3 }' | sed 's:3:34:' | sed 's:44:4:')
echo '# runlevels changed by '$myScriptname ' at ' $(isodate) >> ${theFile}
printf "# chkconfig: $newrunlevels " >> ${theFile}
grep chkconfig ${theFile}.old | awk '{ print $4 " " $5 }' >> ${theFile}

# copy the lines beyond the chkconfig: line
tail -$taillines ${theFile}.old >> ${theFile}
else
echo ${myScriptname}: cannot open $theFile
exit 1
fi


Best Regards, Franz
--
System Manager (Solaris, HP-UX, Linux, some networking, some SAN)