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Top Forums UNIX for Beginners Questions & Answers Substitute particular char in a file Post 302992992 by Don Cragun on Saturday 4th of March 2017 03:58:21 PM
Old 03-04-2017
Can you please provide a small representative sample input file (containing some records that should be changed and some that should not) and also provide the exact output file that you want to produce from that input?

Are the three strings that you're looking for in a record also in a fixed position within the record? If so, in what three character positions do they appear? (They aren't in a fixed position in the sample you provided in post #1; but neither was the 1 that you want to change to a 0.)

What, if anything, delimits records in your file? For example, is a record composed of 305 non-<newline> characters and a <newline> record terminator?
 

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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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