cd
cp -a /usr/share/doc/ .
time find doc -type f -executable -exec chmod -x {} \;
time find doc -type f -executable -exec chmod -x {} +;
find doc -type f -executable -print0 | xargs -0 chmod -x

find / -xdev -uid 1002 -exec chown root {} \;
find / -type f -printf "%s %p\n" | sort -n | tac | head -5

touch -d '12 hours ago'           /tmp/12_hours_ago
touch -d '1 day ago 12 hours ago' /tmp/1_day_ago_12_hours_ago
touch -d '1 day ago'              /tmp/1_day_ago
touch -d '2 days ago'             /tmp/2_days_ago

date -r /tmp/1_day_ago_12_hours_ago

find /tmp -name '*ago' -mtime -1

/tmp/12_hours_ago /tmp/1_day_12_hours_ago

find /tmp -name '*ago' -mtime 1

/tmp/1_day_ago /tmp/1_day__ago

find /tmp -name '*ago' -mtime +1
find /tmp -name '*ago' -mtime +0