Shell Programming and Scripting

#!/usr/bin/bash
#Version: v0.2
#Date:    21th of October, 2009
LOG=1
DEBUG=0
WARN=1
LOGDIR="/opt/logs"
DESTDIR="/export/home/li"
debug()
{
    if [ "$DEBUG" = 1 ] ; then
        /usr/bin/logger -p local7.debug "FileMove:$1"
    fi
}
log()
{
    if [ "$LOG" = 1 ] ; then
        /usr/bin/logger -p local7.notice "FileMove:$1"
    fi
}
warn()
{
    if [ "$WARN" = 1 ] ; then
        /usr/bin/logger -p local7.warn "FileMove:$1"
    fi
}


echo

detect_os()
{
    OS=`uname`
    case $OS in
       Linux) debug "Detecting OS... Linux";;
       SunOS) debug "Detecting OS... Solaris";;
       *) log "Detecting OS... Unknown OS! Only Linux and Solaris are supported so far. Exiting..."; exit 0;;
    esac
}

define_procs()
{
    case $OS in
       Linux)
                ECHO=/bin/echo
                CAT=/bin/cat
                EGREP=/bin/egrep
                GREP=/bin/grep
                SED=/bin/sed
                TR=/usr/bin/tr
                AWK=/bin/awk
                FIND=/usr/bin/find
                XARGS=/usr/bin/xargs
                BC=/usr/bin/bc
                WC=/usr/bin/wc
                ;;
       SunOS)
                ECHO=/usr/bin/echo
                CAT=/usr/bin/cat
                EGREP=/usr/bin/egrep
                GREP=/usr/bin/grep
                SED=/usr/bin/sed
                TR=/usr/bin/tr
                CHOWN=/usr/bin/chown
                MV=/usr/bin/mv
                if [ -f /usr/xpg4/bin/awk ]
                then
                    AWK=/usr/xpg4/bin/awk
                else
                    AWK=/usr/bin/awk
                fi
                FIND=/usr/bin/find
                XARGS=/usr/bin/xargs
                BC=/usr/bin/bc
                WC=/usr/bin/wc
                EXPR=/usr/bin/expr
                CP=/usr/bin/cp
                ;;
    esac
}

secureMove(){
    FILE="$1"
    DESTFILE=$FILE
    COUNTER=`$ECHO $FILE | sed -e 's/\.log$//;s/.*-//g'`

    debug "Current counter value is $COUNTER"

    while [ -f "${DESTDIR}/${DESTFILE}" -o -f "${DESTDIR}/retrieved.${DESTFILE}" ]
    do
        debug "File ${DESTDIR}/(retrieved.)${DESTFILE} exists already. Incrementing counter..."
        COUNTER=`$EXPR $COUNTER + 1`;
        DESTFILE=`$ECHO $DESTFILE | $SED -e "s/[^-][0-9]*\.log$/${COUNTER}\.log/"`
        debug "...new filename $DESTFILE"
    done

   $CHOWN li:li "${FILE}"
   $MV "${FILE}" "${DESTDIR}/${DESTFILE}"
    if [ $? = 0 ]; then
        log "$FILE moved SUCCESSfully to ${DESTDIR}/${DESTFILE}";
    else
        warn "FAILED to move file $FILE!!";
    fi
}

processFile(){
    FILE="$1"
    # make sure file exist and readable
    if [ ! -f $FILE ]; then
        warn " $FILE does not exists"
        exit 1
    elif [ ! -r $FILE ]; then
        warn " Unable to read $FILE"
        exit 2
    fi
    secureMove $FILE
}

processDir(){
    DIR=$1
    filecount=`$FIND ${DIR} -name "*ACCOUNTING*\-*\-*.log" -print | $WC -l | $TR -s '[:space:]' -`
    log "moving ${filecount} accounting files from ${DIR} to ${DESTDIR}"
    cd $LOGDIR
    for FILE in `/usr/bin/ls -1 *ACCOUNTING*\-*\-*.log`
    do
        processFile $FILE
    done
}

detect_os
define_procs
processDir $LOGDIR