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Full Discussion: Command to update last line.
Top Forums UNIX for Dummies Questions & Answers Command to update last line. Post 302545982 by shinny on Wednesday 10th of August 2011 05:59:58 AM
Old 08-10-2011
Hi Zaxxon,
Thanks for the explanation.
the input file looks like this.

Header20110729 02:36
11100000034ATC 00000 MGR0000000000 05177555633051775556IIGRN 0386473260HTR06019960802 JGXA8319991102C874277 HT100019981112C967021 1994101119890813IQ01122 CPS D064134 00010101038647326020040204D064134
11100000065ABC 00000 0000000000 00842891166008428911K9DRN 268440207 959K9D20000720FCP2BU08959VAI19980331IV04279 90000119940530 1970010119700101CPSBATCHFLEX C820377 XXXX00010101345811 19951125
9#EOF# 0000000000000501168


I am little confused with the explanation:
"$2=sprintf("%020d", NR-2) _____ Currently $2 of $0 ie. field 2 of the current (last) line has the value we want to change. So we alter field 2 by printing out the number of lines -2 (lines in awk are called Records and N stands for number, so NR means Number of Records) because we want to subtract the header and the footer line"

I want to modify the last line itself.. so is it going to do the last line or last but one ?

thanks in advance.
 

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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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