cat lab0/** | wc -m 1>>/tmp/tmp.C3jyxRQKQ1
ls -lRtu lab0 2>>/dev/null | grep "s******" | head -n 2
cat lab0/** | sort -r
ls -lRtu lab0 2>>/tmp/tmp.C3jyxRQKQ1 | grep " w"
ls lab0/abomasnow5 | sort >>/tmp/tmp.C3jyxRQKQ1
ls lab0/abomasnow5/** | sort -r