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RZ(1)                                                                    RZ(1)

       rx, rb, rz - XMODEM, YMODEM, ZMODEM (Batch) file receive

       rz [- +8abeOpqRtTuUvy]
       rb [- +abqRtuUvy]
       rx [- abceqRtuUv] file

       This program uses error correcting protocols to receive files over a dial-in serial port from a variety of pro-
       grams running under PC-DOS, CP/M, Unix, and other operating systems.  It is invoked from a shell  prompt  manu-
       ally, or automatically as a result of an "sz file ..." command given to the calling program.

       While  rz  is  smart enough to be called from cu(1), very few versions of cu(1) are smart enough to allow rz to
       work properly.  Unix flavors of Professional-YAM are available for such dial-out application.

       Rz (Receive ZMODEM) receives files with the ZMODEM batch protocol.  Pathnames are supplied by the sending  pro-
       gram, and directories are made if necessary (and possible).  Normally, the "rz" command is automatically issued
       by the calling ZMODEM program, but some defective ZMODEM implementations may require starting rz the old  fash-
       ioned way.

       Rb  receives  file(s)  with  YMODEM, accepting either standard 128 byte sectors or 1024 byte sectors (YAM sb -k
       option).  The user should determine when the 1024 byte block length actually improves throughput without  caus-
       ing lost data or even system crashes.

       If  True  YMODEM (Omen Technology trademark) file information (file length, etc.)  is received, the file length
       controls the number of bytes written to the output dataset, and the modify time and file mode  (iff  non  zero)
       are set accordingly.

       If  no  True  YMODEM  file  information is received, slashes in the pathname are changed to underscore, and any
       trailing period in the pathname is eliminated.  This conversion is useful for files received from CP/M systems.
       With YMODEM, each file name is converted to lower case unless it contains one or more lower case letters.

       Rx  receives  a  single  file  with XMODEM or XMODEM-1k protocol.  The user should determine when the 1024 byte
       block length actually improves throughput without causing problems.  The user must supply the file name to both
       sending and receiving programs.  Up to 1023 garbage characters may be added to the received file.

       Rz  may be invoked as rzCOMMAND (with an optional leading - as generated by login(1)).  For each received file,
       rz will pipe the file to ''COMMAND filename'' where filename is the name of the transmitted file with the  file
       contents as standard input.

       Each  file transfer is acknowledged when COMMAND exits with 0 status.  A non zero exit status terminates trans-

       A typical use for this form is rzrmail which calls rmail(1) to post mail to the user specified by the transmit-
       ted  file  name.   For  example,  sending the file "caf" from a PC-DOS system to rzrmail on a Unix system would
       result in the contents of the DOS file "caf" being mailed to user "caf".

       On some Unix systems, the login directory must contain a link to COMMAND as login sets SHELL=rsh  which  disal-
       lows  absolute  pathnames.   If invoked with a leading ''v'', rz will be verbose (see v option).  The following
       entry works for Unix SYS III/V:
       If the SHELL environment variable includes rsh , rbash or rksh (restricted shell), rz will not accept  absolute
       pathnames or references to a parent directory, will not modify an existing file, and removes any files received
       in error.

       If rz is invoked with stdout and stderr to different datasets, Verbose is set to  2,  causing  frame  by  frame
       progress reports to stderr.  This may be disabled with the q option.

       The meanings of the available options are:

       -+, --append
              append received data to an existing file (ZMODEM, ASCII only).
       -a, --ascii
              Convert  files  to  Unix conventions by stripping carriage returns and all characters beginning with the
              first Control Z (CP/M end of file).
       -b, --binary
              Binary (tell it like it is) file transfer override.
       -B NUMBER, --bufsize NUMBER
              Buffer NUMBER bytes before writing to disk. Default ist 32768, which should be enough  for  most  situa-
              tions.  If  you  have  a slow machine or a bad disk interface or suffer from other hardware problems you
              might want to increase the buffersize.  -1 or auto use a buffer large enough to buffer the  whole  file.
              Be careful with this options - things normally get worse, not better, if the machine starts to swap.
       -c, --with-crc
              XMODEM only. Use 16 bit CRC (normally a one byte checksum is used).
       -C, --allow-remote-commands
              allow  remote  command  execution  (  insecure ). This allows the sender to execute an arbitrary command
              through system () or execl (). Default is to disable this feature (?). This option is ignored if running
              in restricted mode.
       -D, --null
              Output file data to /dev/null; for testing.  (Unix only)
       --delay-startup N
              Wait N seconds before doing anything.
       -e, --escape
              Force sender to escape all control characters; normally XON, XOFF, DLE, CR-@-CR, and Ctrl-X are escaped.
       -E, --rename
              Rename incoming file if target filename already exists. The new file name will have a dot and  a  number
              (0..999) appended.
       -h, --help
              give help screen.
       -m N, --min-bps N
              Stop  transmission  if  BPS-Rate (Bytes Per Second) falls below N for a certain time (see --min-bps-time
       -M N, --min-bps-time
              Used together with --min-bps. Default is 120 (seconds).
       -O, --disable-timeouts
              Disable read timeout handling code. This makes lrz hang if the  sender  does  not  send  any  more,  but
              increases  performance (a bit) and decreases system load (through reducing the number of system calls by
              about 50 percent).

              Use this option with care.
              Open output files in synchronous write mode. This may be useful if you experience  errors  due  to  lost
              interrupts  if update (or bdflush or whoever this daemon is called on your system) writes the buffers to
              the disk.

              This option is ignored and a warning is printed if your systems doesn't support O_SYNC.
       -p, --protect
              (ZMODEM) Protect: skip file if destination file exists.
       -q, --quiet
              Quiet suppresses verbosity.
       -r, --resume
              Crash recovery mode. lrz tries to resume interrupted file transfers.
       -R, --restricted
              Enter more restricted mode. lrz will not create directories or files with a leading dot if  this  option
              is given twice.

              See SECURITY for mode information about restricted mode.
       -s HH:MM, --stop-at HH:MM
              Stop  transmission  at HH hours, MM minutes. Another variant, using +N instead of HH:MM, stops transmis-
              sion in N seconds.
       -S, --timesync
              Request timesync packet from the sender. The sender sends its system time, causing lrz to complain about
              more then 60 seconds difference.

              Lrz  tries  to set the local system time to the remote time if this option is given twice (this fails if
              lrz is not run by root).

              This option makes lrz incompatible with certain other ZModems. Don't use it unless you know what you are
              turn  syslogging  on  or off. the default is set at configure time.  This option is ignored if no syslog
              support is compiled in.
       -t TIM, --timeout TIM
              Change timeout to TIM tenths of seconds. This is ignored if timeout handling is turned of through the  O
       --tcp-client ADDRESS:PORT
              Act as a tcp/ip client: Connect to the given port.

              See --tcp-server for more information.

              Act as a server: Open a socket, print out what to do, wait for connection.

              You  will  normally not want to use this option as lrzsz is the only zmodem which understands what to do
              (private extension). You might want to use this if you have to use zmodem (for which  reason  whatever),
              and  cannot use the --tcp option of lsz (perhaps because your telnet doesn't allow to spawn a local pro-
              gram with stdin/stdout connected to the remote side).

              If you use this option you have to start lsz with the --tcp-client ADDRESS:PORT option.  lrz will  print
              the address and port on startup.

              Use  of  this  option  imposes  a security risk, somebody else could connect to the port in between. See
              SECURITY for details.
       -U, --unrestrict
              turn off restricted mode (this is not possible if running under a restricted shell).
              prints out version number.
       -v, --verbose
              Verbose causes a list of file names to be appended to stderr.  More v's generate more output.
       -wN, --windowsize N
              Set window size to N.
       -X, --xmodem
              use XMODEM protocol.
       -y, --overwrite
              Yes, clobber any existing files with the same name.
              use YMODEM protocol.
       -Z, --zmodem
              use ZMODEM protocol.

       Contrary to the original ZMODEM lrz defaults to restricted mode. In restricted mode lrz will not  accept  abso-
       lute  pathnames  or  references  to a parent directory, will not modify an existing file, and removes any files
       received in error. Remote command execution is disabled.

       To use a more restricted mode set the environment variable ZMODEM_RESTRICTED or give the R  option.  This  dis-
       ables creation of subdirectories and invisible files.

       Restricted mode may be turned off with the U option, unless lrz runs under a restricted shell.

       Use of the
              --tcp-client or --tcp-server options imposes a security risk, as somebody else could connect to the port
              before you do it, and grab your data. If there's strong demand for a more secure mode i might  introduce
              some sort of password challenge.

       lrz uses the following environment variables:

       SHELL  lrz recognizes a restricted shell if this variable includes rsh or rksh

              lrz enters the more restricted mode if the variable is set.

(Pro-YAM command)
Pro-YAM Command: sz *.h *.c
(This automatically invokes rz on the connected system.)

       ZMODEM.DOC, YMODEM.DOC, Professional-YAM, crc(omen), sz(omen), usq(omen), undos(omen)

       Compile time options required for various operating systems are described in the source file.

       Sending serial data to timesharing minicomputers at sustained high speeds has been known to cause lockups, sys-
       tem halts, kernel panics, and occasional antisocial behaviour.  When experimenting with high speed input  to  a
       system,  consider  rebooting the system if the file transfers are not successful, especially if the personality
       of the system appears altered.

       The Unix "ulimit" parameter must be set high enough to permit large file transfers.

       The TTY input buffering on some systems may not allow long blocks or streaming input at high speed.  You should
       suspect this problem when you can't send data to the Unix system at high speeds using ZMODEM, YMODEM-1k or XMO-
       DEM-1k, when YMODEM with 128 byte blocks works properly.  If the system's tty line handling is  really  broken,
       the serial port or the entire system may not survive the onslaught of long bursts of high speed data.

       The  DSZ  or  Pro-YAM  zmodem  l numeric parameter may be set to a value between 64 and 1024 to limit the burst
       length ("zmodem pl128").

       32 bit CRC code courtesy Gary S. Brown.  Directory creation code from John Gilmore's PD TAR program.

       Calling rz from most versions of cu(1) doesn't work because cu's receive process fights rz for characters  from
       the modem.

       Programs  that  do  not properly implement the specified file transfer protocol may cause sz to "hang" the port
       for a minute or two.  Every reported instance of this problem has been corrected by using  ZCOMM,  Pro-YAM,  or
       other program with a correct implementation of the specified protocol.

       Many  programs  claiming  to  support  YMODEM only support XMODEM with 1k blocks, and they often don't get that
       quite right.

       Pathnames are restricted to 127 characters.  In XMODEM single file mode, the pathname given on the command line
       is  still  processed  as  described  above.   The  ASCII  option?s CR/LF to NL translation merely deletes CR?s;
       undos(omen) performs a more intelligent translation.

       The VMS version does not set the file time.

       VMS C Standard I/O and RMS may interact to modify file contents unexpectedly.

       The VMS version does not support invocation as rzCOMMAND .  The current VMS version does  not  support  XMODEM,
       XMODEM-1k, or YMODEM.

       According to the VMS documentation, the buffered input routine used on the VMS version of rz introduces a delay
       of up to one second for each protocol transaction.  This delay may be significant for very short files.  Remov-
       ing the "#define BUFREAD" line from rz.c will eliminate this delay at the expense of increased CPU utilization.

       The VMS version causes DCL to generate a random off the wall error message under some error conditions; this is
       a result of the incompatibility of the VMS "exit" function with the Unix/MSDOS standard.

       Rz supports incoming ZMODEM binary (-b), ASCII (-a), protect (-p), clobber (-y), and append (-+) requests.  The
       default is protect (-p) and binary (-b).

       The Unix versions support ZMODEM command execution.

       rz.c, crctab.c, rbsb.c, zm.c, zmodem.h Unix source files.

       rz.c, crctab.c, vrzsz.c, zm.c, zmodem.h, vmodem.h, vvmodem.c, VMS source files.

                                     OMEN                                RZ(1)