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Full Discussion: how to find lenght of fixed width file record?
Top Forums UNIX for Advanced & Expert Users how to find lenght of fixed width file record? Post 302710345 by jim mcnamara on Thursday 4th of October 2012 08:47:23 AM
Old 10-04-2012
'fixed width records' does not necessarily mean carriage control ("\n") at the end of a line. It just means the data are laid out in a fixed pattern, probably with no character to mark then end of the line. If it is a fixed record length file with carriage control, then just read the very first line.
Code:
awk '{print length($0); exit}' infile

Without carriage control you will have a much harder time finding the record length, generally you need to get that information from a source external to the file: file metadata, specifications, someone who knows.
 

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LEARN ABOUT DEBIAN

tcfmgr

TCFMGR(1)							   Tokyo Cabinet							 TCFMGR(1)

NAME

       tcfmgr - the command line utility of the fixed-length database API

DESCRIPTION

       The  command `tcfmgr' is a utility for test and debugging of the fixed-length database API and its applications.  `path' specifies the path
       of a database file.  `width' specifies the width of the value of each record.  `limsiz' specifies the limit  size  of  the  database  file.
       `key' specifies the key of a record.  `value' specifies the value of a record.  `file' specifies the input file.

	      tcfmgr create path [width [limsiz]]
		     Create a database file.
	      tcfmgr inform [-nl|-nb] path
		     Print miscellaneous information to the standard output.
	      tcfmgr put [-nl|-nb] [-sx] [-dk|-dc|-dai|-dad] path key value
		     Store a record.
	      tcfmgr out [-nl|-nb] [-sx] path key
		     Remove a record.
	      tcfmgr get [-nl|-nb] [-sx] [-px] [-pz] path key
		     Print the value of a record.
	      tcfmgr list [-nl|-nb] [-m num] [-pv] [-px] [-rb lkey ukey] [-ri str] path
		     Print keys of all records, separated by line feeds.
	      tcfmgr optimize [-nl|-nb] path [width [limsiz]]
		     Optimize a database file.
	      tcfmgr importtsv [-nl|-nb] [-sc] path [file]
		     Store records of TSV in each line of a file.
	      tcfmgr version
		     Print the version information of Tokyo Cabinet.

       Options feature the following.

	      -nl : enable the option `FDBNOLCK'.
	      -nb : enable the option `FDBLCKNB'.
	      -sx : the input data is evaluated as a hexadecimal data string.
	      -dk : use the function `tcfdbputkeep' instead of `tcfdbput'.
	      -dc : use the function `tcfdbputcat' instead of `tcfdbput'.
	      -dai : use the function `tcfdbaddint' instead of `tcfdbput'.
	      -dad : use the function `tcfdbadddouble' instead of `tcfdbput'.
	      -px : the output data is converted into a hexadecimal data string.
	      -pz : do not append line feed at the end of the output.
	      -m num : specify the maximum number of the output.
	      -pv : print values of records also.
	      -rb lkey ukey : specify the range of keys.
	      -ri str : specify the interval notation of keys.
	      -sc : normalize keys as lower cases.

       This command returns 0 on success, another on failure.

SEE ALSO

       tcftest(1), tcfmttest(1), tcfdb(3), tokyocabinet(3)

Man Page							    2011-02-12								 TCFMGR(1)
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