Re: Script to build system information. Guru needed :)

[Peter.Robinson@t-online.de (Peter Robinson)]

On Tue, 2004-12-21 at 18:30, Bob Alexander wrote:
> Slowly building my "disaster assurance" strategy on top of the file backups.
> 
> Amongst other things I want to periodically run a shell script that 
> would build a file with useful information. Here it is:
> 
> lsmod
> lspci
> dpkg --get-selections
> sudo fdisk -l /dev/hda
> df
> uname -a
> 
> Now the questions:
> 
> 1) Other useful commands I am not thinking about ?
> 2) I would like to redirect the output to a file called with the 
> catenation of 'uname -n'.'uname -r'.config.YYYYMMDDHHMM.txt where 
> YYYYMMDDHHMM is a timestamp of the command execution time. How do I 
> obtain such value ? How do I create the required backticks on my laptop 
> keyboard (no separate numpad)
> 3) If I use cron to run this everyday, being this a laptop client, will 
> the due command be executed if it's natural time has expired ?
> 4) What is the easiest way to keep the last N versions of such files ?
> 

Here is an excerpt of a backup script I use that shows one way of
keeping the last N versions of some files, probably you can adapt it to
your needs:

hth
peter

#!/bin/sh
(.....)
# Each of these directories corresponds to the archive name in the
backup.conf
# file. If necessary, the script creates the directory. Within the
directory
# are n archive files (configurable by REATAIN=n) with a naming
convention
# <archive>.<YYYYMMDD>.tar.gz

RETAIN=25 #number of copies of the archive to keep
(...)
CUT='/usr/bin/cut'
GZIP='/bin/gzip'
RM='/bin/rm'
WC='/usr/bin/wc'
MKDIR='/bin/mkdir'
DATE='/bin/date'
TAR='/bin/tar'
HEAD='/usr/bin/head'



e
echo "Will backup with stamp $STAMP and DBSTAMP $DBSTAMP"


## Note. $$ evaluates to pid of current proc.
## The following ls command will return an error
## if there do not yet exist db backup files. 
${LS} ${WDIR}/backup/all_databases-* > $$.TMP
if [ ! -f $$.TMP ] ; then
	echo "Need to create $$.TMP"
	touch $$.TMP
fi



NFLDUMP=`${WC} -l < $$.TMP`   ## if $$.TMP is empty, we will get ZERO as
needed
echo "NFLDUMP $NFLDUMP"


NUMBER_OF_DUMPS_TO_DEL=`/usr/bin/expr ${NFLDUMP} \- ${RETAIN}` 
if [ ${NUMBER_OF_DUMPS_TO_DEL} -gt "0" ]
    then
${RM} `${HEAD} -${NUMBER_OF_FILES_TO_DEL} $$.TMP`
fi

echo "NUMBER DUMSP TO DEL $NUMBER_OF_DUMPS_TO_DEL"



${RM} -rf $$.TMP



while read i
    do
    echo '****   Backing up ' $i
    STAMP=`${DATE} "+%Y%m%d"`
    TIME=`${DATE} "+%H:%M:%S"` # date and time stamp
    echo "****  Time stamp: " ${STAMP} - ${TIME}

    TARGET=`echo $i | ${CUT} -f1 -d:`
    PATH=`echo $i | ${CUT} -f2 -d:`
    LOCATION=${WDIR}
   
    echo Archive: ${TARGET}
    echo Path: ${PATH}
    echo Stored in: ${LOCATION}/backup

    if [ ! -e ${PATH} ]
	then
	echo Configuration error:
	echo Target: ${TARGET}
	echo Path: ${PATH} does not exist
	echo "CHECK CONFIG FILE !!!!!!!!!!!!!!!!!!!!"
	exit 1
    fi

    if [ ! -d  ${LOCATION}/backup/${TARGET} ]
	then
	echo Creating target directory \`${TARGET}\`
	${MKDIR}  ${LOCATION}/backup/${TARGET}
    fi

    cd  ${LOCATION}/backup/${TARGET}
    
    ${LS} ${LOCATION}/backup/${TARGET}.*.tar.gz > $$.TMP
    NFL=`${WC} -l < $$.TMP`
   
   
    NUMBER_OF_FILES_TO_DEL=`/usr/bin/expr ${NFL} \- ${RETAIN}`
    
    if [ ${NUMBER_OF_FILES_TO_DEL} -gt "0" ]
	then
	${RM} `${HEAD} -${NUMBER_OF_FILES_TO_DEL} $$.TMP`
    fi
    ${RM} -rf $$.TMP

    echo ****  Creating  ${LOCATION}/backup/${TARGET}.${STAMP}.tar.gz

    echo "*** full backup of ${PATH} on ${STAMP} at ${TIME} ****"

   echo "*** tarrifying: ${LOCATION}/backup/${TARGET}.${STAMP}.tar.gz
***"
   ${TAR} cvf - ${PATH} | ${GZIP} -9 > 
${LOCATION}/backup/${TARGET}/${TARGET}.${STAMP}.tar.gz
    
    if [ $? != $SUCCESS ] ; then 
    	echo "Could not tar $TARGET"
	exit 1
    fi
    
    echo 'DONE'
    done < $CONFIG_FILE



# Explanations

# 1) Read one line at a time from $CONFIG_FILE, store in i
# while read i
#   do
#   done < $CONFIG_FILE
#
# 2) cut
# cut -f1 first field; -f2 second field -d delimiter
# cut -f2 -d: means take the second field according to delimiter ':'
# in this case we have myPerl:/home/peter/myPerl being processed
# to /home/peter/myPerl
#




-- 
Peter N. Robinson
peter.robinson@t-online.de
peter.robinson@charite.de
http://www.charite.de/ch/medgen/robinson/