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Full Discussion: Backingup larger files with TAR command
Top Forums Shell Programming and Scripting Backingup larger files with TAR command Post 302940736 by frizcala on Wednesday 8th of April 2015 04:09:22 PM
Old 04-08-2015
We need to copy de files compressed to a tape. I don't know if the space on disk is enought for the compression process thats what I talk about MKNOD command. Using pipes the files are compressed and sent to the tape without left temporal files in server.
 

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LEARN ABOUT BSD

mt

MT(1)							      General Commands Manual							     MT(1)

NAME

       mt - magnetic tape manipulating program

SYNOPSIS

       mt [ -f tapename ] command [ count ]

DESCRIPTION

       Mt  is  used  to  give commands to a magnetic tape drive.  If a tape name is not specified, the environment variable TAPE is used;  if TAPE
       does not exist, mt uses the device /dev/rmt12.  Note that tapename must reference a raw (not block) tape device.  By  default  mt  performs
       the requested operation once.  Operations may be performed multiple times by specifying count.

       The available commands are listed below.  Only as many characters as are required to uniquely identify a command need be specified.

       eof, weof
	      Write count end-of-file marks at the current position on the tape.

       fsf    Forward space count files.

       fsr    Forward space count records.

       bsf    Back space count files.

       bsr    Back space count records.

       rewind Rewind the tape (Count is ignored).

       offline, rewoffl
	      Rewind the tape and place the tape unit off-line (Count is ignored).

       status Print status information about the tape unit.

       cacheon
	      Enable the readahead/writebehind cache on the tape unit.

       cacheoff
	      Turn off the readahead/writebehind cache on the tape unit.

       Mt returns a 0 exit status when the operation(s) were successful, 1 if the command was unrecognized, and 2 if an operation failed.

       The cacheon and cacheoff commands currently only apply to the TMSCP driver and then only for certain drives such as the TU81+.  No error is
       produced by the TMSCP driver if the cache commands are used.  Other drivers will return an error code  since  they  do  not  recognize  the
       MTCACHE and MTNOCACHE functions codes.  See mtio(4).

FILES

       /dev/rmt* Raw magnetic tape interface

SEE ALSO

       mtio(4), tmscp(4), dd(1), ioctl(2), environ(7)

4th Berkeley Distribution					 December 22, 1995							     MT(1)
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