echo t12esting | tr -d '[[:alpha:]]' > logfile.gnu echo t12esting | tr -d '[:alpha:]' >> logfile.gnu echo t12esting | tr -d '[[:alpha:]' >> logfile.gnu echo t12esting | tr -d '[[:alpha:' >> logfile.gnu echo t12esting | tr -d '[[:alpha' >> logfile.gnu echo t12esting | tr -d '[:alpha:]' >> logfile.gnu echo t12esting | tr -d '[:alpha:' >> logfile.gnu echo t12esting | tr -d '[:alpha' >> logfile.gnu echo t12esting | busybox tr -d '[[:alpha:]]' > logfile.bb echo t12esting | busybox tr -d '[:alpha:]' >> logfile.bb echo t12esting | busybox tr -d '[[:alpha:]' >> logfile.bb echo t12esting | busybox tr -d '[[:alpha:' >> logfile.bb echo t12esting | busybox tr -d '[[:alpha' >> logfile.bb echo t12esting | busybox tr -d '[:alpha:]' >> logfile.bb echo t12esting | busybox tr -d '[:alpha:' >> logfile.bb echo t12esting | busybox tr -d '[:alpha' >> logfile.bb diff -u logfile.gnu logfile.bb