Multi-process folder archiving

archive.sh

#!/bin/bash
 
# purpose: to compress my home folder
 
#output folder for the files
OUTPUTDIR="/media/My Book/HomeFolderBackup/"
 
#number of compressing process
NPROC=6
 
#queue stuff
QUEUE=""
NUM=0
function queue {
        QUEUE="$QUEUE $1"
        NUM=$(($NUM+1))
}
function regeneratequeue {
        OLDREQUEUE=$QUEUE
        QUEUE=""
        NUM=0
        for PID in $OLDREQUEUE
        do
                if [ -d /proc/$PID ]; then
                        QUEUE="$QUEUE $PID"
                        NUM=$((NUM + 1))
                fi
        done
}
function checkqueue {
        OLDCHQUEUE=$QUEUE
        for PID in $OLDCHQUEUE
        do
                if [ ! -d /proc/$PID ]; then
                        regeneratequeue
                        break
                fi
        done
}
 
#put the list of files into a file
 
ls -l > archiveList.txt
 
#and loop through
I=0
cat archiveList.txt | while read line
do
        FNAME=$(echo ${line} | awk '{ print $8 }')
        tar pcvzf "${OUTPUTDIR}${FNAME}.tar.gz" "${FNAME}" &
 
        PID=$!
        queue $PID
 
        while [ $NUM -ge $NPROC ]; do
                checkqueue
                sleep 0.4
        done
done