File pre_checkin.sh of Package python3

#!/bin/bash
# This script is called automatically during autobuild checkin.

master=python3-base.spec
slaves=python3.spec

sections="COMMON-PATCH COMMON-DEF COMMON-PREP"

for slave in $slaves; do # yes, you are right. we don't need the 'for'. but as long as it's there, why not keep it
{
    prev=1
    for section in $sections; do
        begin="/$section-BEGIN/"
        end="/$section-END/"
        sed -n -e "${prev},${begin}p" $slave
        sed -n -e "${begin},${end}p" $master | head -n -1 | tail -n +2
        prev=$end
    done
    sed -n -e "${prev},\$p" $slave
} > $slave.tmp && mv $slave.tmp $slave
done