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Full Discussion: fuzzy sequence match in a text file
Top Forums Shell Programming and Scripting fuzzy sequence match in a text file Post 302700949 by hexram on Friday 14th of September 2012 12:45:00 PM
Old 09-14-2012
I don't follow the logic behind
Code:
if(skip != 0 || $2+0 == day + 2) skip=1

# or
if (skip == 0) {
    if ($2+0 == day + 2) skip =1
}

being equivalent... The first statement is "if ((skip is not 0) OR (($2+0) equals (day + 2)))", but your second expression is "if (skip equals 0) THEN if (($2+0) is equal to (day + 2))", and as such it is NOT equivalent to the first one; in the first statement it suffices that "(skip is not 0)" to make "skip=1", but in the second expression this is not true. As I see it, the second expression is equivalent to "if ((skip equals 0) AND (($2+0) equals (day + 2)))", which is clearly different from the first statement.
 

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LEARN ABOUT DEBIAN

read_tape

READ_TAPE(8)						       AFS Command Reference						      READ_TAPE(8)

NAME

       read_tape - Reads volume dumps from a backup tape to a file

SYNOPSIS

       read_tape -tape <tape device>
	  -restore <# of volumes to restore>
	  -skip <# of volumes to skip>
	  -file <filename> [-scan] [-noask] [-label]
	  [-vheaders] [-verbose] [-help]

DESCRIPTION

       read_tape reads an OpenAFS backup tape and prompts for each dump file to save.  This command does not require any OpenAFS infrastructure.
       This command does not need an OpenAFS client or server to be available, which is not the case with the backup(8) command.

       The dump files will be named for the Read/Write name of the volume restored.  After saving each dump file, vos restore or restorevol can be
       used to restore the volume into AFS and non-AFS space respectively.

       read_tape reads the tape while skipping the specified number of volumes.  After that, it restores the specified number of volumes.
       read_tape doesn't rewind the tape so that it may be used multiple times in succession.

OPTIONS

       -tape <tape device>
	   Specifies the tape device from which to restore.

       -restore <# of volumes to restore>
	   Specifies the number of volumes to restore from tape.

       -skip <# of volumes to skip>
	   Specifies the number of volumes to skip before starting the restore.

       -file <filename>
	   Specifies an alternate name for the restored volume dump file rather than the default of the volume name.

       -scan
	   Scans the tape.

       -noask
	   Doesn't prompt for each volume.

       -label
	   Displays the full dump label.

       -vheaders
	   Displays the full volume headers.

       -verbose
	   Produces on the standard output stream a detailed trace of the command's execution.	If this argument is omitted, only warnings and
	   error messages appear.

       -help
	   Prints the online help for this command. All other valid options are ignored.

EXAMPLES

       The following command will read the third through fifth volumes from the tape device /dev/tape without prompting:

	  % read_tape -tape /dev/tape -skip 2 -restore 3 -noask

PRIVILEGE REQUIRED

       The issuer must have access to read and write to the specified tape device.

SEE ALSO

       backup(8), restorevol(1), vos_restore(1)

COPYRIGHT

       Copyright 2007 Jason Edgecombe <jason@rampaginggeek.com>

       This documentation is covered by the BSD License as written in the doc/LICENSE file. This man page was written by Jason Edgecombe for
       OpenAFS.

OpenAFS 							    2012-03-26							      READ_TAPE(8)
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