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SZ(1)                       General Commands Manual                      SZ(1)

       sz - send a file using the zmodem protocol

       sz [-LNbdefnopqruvy+] [-ci command] [-Ll n] [-t timeout]

       -L   # Use n-byte packets

       -N   # Overwrite if source is newer/longer

       -b   # Binary file

       -c   # Send command for execution

       -d   # Convert dot to slash in names

       -e   # Escape for all control characters

       -f   # Send full path name

       -i   # Send command and return immediately

       -l   # Flow control every n packets

       -n   # Overwrite destination if source is newer

       -o   # Use old (16-bit) checksum

       -p   # Protect file if it already exists

       -q   # Quiet; opposite of verbose

       -r   # Resume interrupt file transfer

       -t   # Set timeout in tenths of a second

       -u   # Unlink file after successful transmission

       -v   # Verbose; opposite of quiet

       -y   # Yes, clobber existing files

       -+   # Append to an existing file

       sz file </dev/tty01 >/dev/tty01
                           # Send file

       XMODEM,  YMODEM,  and  ZMODEM are a family of protocols that are widely
       used is the MS-DOS world for transferring information reliably from one
       computer  to another.  In all of these protocols, a series of bytes are
       sent from one computer to the other, and  then  an  acknowledgement  is
       sent  back  to confirm correct reception.  Checksums are used to detect
       errors so that transmission is reliable  even  in  the  face  of  noisy
       telephone  lines.   Sz is a program that sends a file sent from another
       computer using the zmodem protocol.  The file can be received using rz.

       Sz uses the ZMODEM error correcting protocol to send one or more  files
       over a dial-in serial port to a variety of programs running under MINIX
       3, UNIX, MS-DOS, CP/M, VMS, and other operating  systems.   It  is  the
       successor to XMODEM and YMODEM.

       ZMODEM  greatly  simplifies  file  transfers  compared  to  XMODEM.  In
       addition  to  a  friendly  user  interface,  ZMODEM  provides  Personal
       Computer  and  other  users  an  efficient,  accurate,  and robust file
       transfer method.

       ZMODEM provides complete end-to-end data integrity between  application
       programs.   ZMODEM's 32 bit CRC catches errors that sneak into even the
       most advanced networks.

       Output from another program may be piped  to  sz  for  transmission  by
       denoting standard input with -:

            "ls -l | sz -

       The  program  output is transmitted with the filename where PID
       is the process ID of the sz program.  If the environment variable ONAME
       is set, that is used instead.  In this case, the command:

            "ls -l | ONAME=con sz -ay -

       will  send  a  'file'  to  the  PC-DOS  console display.  The -y option
       instructs the receiver to open the file  for  writing  unconditionally.
       The  -a  option  causes the receiver to convert UNIX newlines to PC-DOS
       carriage  returns  and  linefeeds.    On   UNIX   systems,   additional
       information  about  the  file is transmitted.  If the receiving program
       uses this information, the transmitted file length controls  the  exact
       number  of bytes written to the output dataset, and the modify time and
       file mode are set accordingly.

       If sz is invoked with $SHELL set and  if  that  variable  contains  the
       string  rsh or rksh (restricted shell), sz operates in restricted mode.
       Restricted mode restricts pathnames to the current directory and PUBDIR
       (usually /usr/spool/uucppublic) and/or subdirectories thereof.

       The options and flags available are:
         Instruct the receiver to append transmitted data to an existing file.
         Convert NL characters in the transmitted file to CR/LF.  This is done
         by the sender for XMODEM and YMODEM, by the receiver for ZMODEM.
         Binary override: transfer file without any translation.
         Send COMMAND (follows c) to the receiver for execution,  return  with
         COMMAND's exit status.
         Change  all  instances  of  '.'  to  '/' in the transmitted pathname.
         Thus, C.omenB0000 (which  is  unacceptable  to  MS-DOS  or  CP/M)  is
         transmitted  as C/omenB0000.  If the resultant filename has more than
         8 characters in the stem, a '.' is  inserted  to  allow  a  total  of
         Escape  all control characters; normally XON, XOFF, DLE, CR-@-CR, and
         Ctrl-X are escaped.
         Send Full pathname.  Normally directory prefixes  are  stripped  from
         the transmitted filename.
         Send  COMMAND  (follows  i)  to  the  receiver  for execution, return
         Immediately upon the receiving program's successful reception of  the
         Use  ZMODEM sub-packets of length n (follows L).  A larger n (32 <= n
         <= 1024) gives slightly higher throughput, a smaller one speeds error
         recovery.   The default is 128 below 300 baud, 256 above 300 baud, or
         1024 above 2400 baud.
         Wait for the receiver to acknowledge correct data every n (32 <= n <=
         1024)  characters.   This  may  be used to avoid network overrun when
         XOFF flow control is lacking.
         Send each  file  if  destination  file  does  not  exist.   Overwrite
         destination file if source file is newer than the destination file.
          Send  each  file  if  destination  file  does  not exist.  Overwrite
         destination  file  if  source  file  is  newer  or  longer  than  the
         destination file.
         Disable automatic selection of 32 bit CRC.
         Protect  existing  destination  files  by  skipping  transfer  if the
         destination file exists.
         Quiet suppresses verbosity.
         Resume interrupted file transfer.  If the source file is longer  than
         the  destination  file,  the  transfer commences at the offset in the
         source file that equals the length of the destination file.
         Change timeout.  The timeout, in tenths of seconds, follows,  the  -t
         Unlink the file after successful transmission.
         Limit the transmit window size to n bytes (n follows (enw).
         Verbose causes a list of file names to be appended to /tmp/szlog.
         Instruct  a  ZMODEM  receiving program to overwrite any existing file
         with the same name.
         Instruct a ZMODEM receiving program to overwrite  any  existing  file
         with  the same name, and to skip any source files that do have a file
         with the same pathname on the destination system.

       Below are some examples of the use of sz.

            "sz -a *.c

       This single command transfers all .c files  in  the  current  directory
       with  conversion  (-a)  to  end-of-line  conventions appropriate to the
       receiving environment.

            "sz -Yan *.c *.h

       Send only the .c and .h files that exist on both systems, and are newer
       on  the  sending system than the corresponding version on the receiving
       system, converting MINIX 3 to MS-DOS text format.

       rz(1), term(1).