rz命令：

    (X) = option applies to XMODEM only
    (Y) = option applies to YMODEM only
    (Z) = option applies to ZMODEM only
  -+, --append                append to existing files
  -a, --ascii                 ASCII transfer (change CR/LF to LF)
  -b, --binary                binary transfer
  -B, --bufsize N             buffer N bytes (N==auto: buffer whole file)
  -c, --with-crc              Use 16 bit CRC (X)
  -C, --allow-remote-commands allow execution of remote commands (Z)
  -D, --null                  write all received data to /dev/null
      --delay-startup N       sleep N seconds before doing anything
  -e, --escape                Escape control characters (Z)
  -E, --rename                rename any files already existing
      --errors N              generate CRC error every N bytes (debugging)
  -h, --help                  Help, print this usage message
  -m, --min-bps N             stop transmission if BPS below N
  -M, --min-bps-time N          for at least N seconds (default: 120)
  -O, --disable-timeouts      disable timeout code, wait forever for data
      --o-sync                open output file(s) in synchronous write mode
  -p, --protect               protect existing files
  -q, --quiet                 quiet, no progress reports
  -r, --resume                try to resume interrupted file transfer (Z)
  -R, --restricted            restricted, more secure mode
  -s, --stop-at {HH:MM|+N}    stop transmission at HH:MM or in N seconds
  -S, --timesync              request remote time (twice: set local time)
      --syslog[=off]          turn syslog on or off, if possible
  -t, --timeout N             set timeout to N tenths of a second
  -u, --keep-uppercase        keep upper case filenames
  -U, --unrestrict            disable restricted mode (if allowed to)
  -v, --verbose               be verbose, provide debugging information
  -w, --windowsize N          Window is N bytes (Z)
  -X  --xmodem                use XMODEM protocol
  -y, --overwrite             Yes, clobber existing file if any
      --ymodem                use YMODEM protocol
  -Z, --zmodem                use ZMODEM protocol
 

-a 表示使用ascii碼格式傳輸檔案，如果是Dos格式的檔案，會轉換為unix格式
-b –binary 用binary的方式上傳下載，不解釋字元為ascii
-e–escape 強制escape 所有控制字元，比如Ctrl+x，DEL等
-r 使用 Crash recovery mode. 即檔案傳輸中斷會重傳
-y 表示檔案已存在的時候會覆蓋
-O (大寫O)採用同步寫模式，以處理從快取寫到磁碟時中斷丟失的情況
--o-sync  同上