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Add & at the end of your commands

wc -l file1.txt &
wc -l file2.txt &
wc -l file3.txt &
wc -l file4.txt &

What is your attempt to solve this?

echo "5 52" | awk '{s=int($2/$1);r=$2-s*$1;for (i=0;i<$1;i++) {for (j=0;j<s;j++) printf "%s ",i*10+j;print ""};for (i=0;i<r;i++) printf "%s ",i+s*$1;print ""}'
0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15...

I guess this can be shorten to:
awk 'NR==FNR{a[$1];next}!(FNR in a)' file2 file1

one more..


sed `printf "%sd;" $(cat file2)` file1

Try this:
awk 'NR==FNR{a[$1]=$1;next}!(FNR in a)' file2 file1

rec=ABC,1234,55.00
Colno=2
coldel=,

fd=$coldel
fprint=$(echo "'{print \$$Colno }'")

eval echo "echo $rec | awk -F\"$fd\" $fprint"