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Full Discussion: Explanation of Nawk command
Top Forums UNIX for Beginners Questions & Answers Explanation of Nawk command Post 303032949 by RudiC on Wednesday 27th of March 2019 05:34:08 AM
Old 03-27-2019
Quote:
Originally Posted by kirans.229
Code:
{s=s sep $2; sep="|"; next} $0~s {c++} END {print c+0}

In the above, where is it mentioned that it is a 'comma' separated field.
Nowhere. -F, sets the field separator.


Quote:
what does 'sep' denotes here. sep="|" i was thinking that it is a pipe separator.
That's a variable name, and yes, it's intended to be used a separator


Quote:
and what does s=s denotes here ?
It a variable assignment, but incompletely quoted. s=s sep $2 is the complete one, assigning the concatenation of s'(old) value, sep, and field two to (new) s .
 

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TCATEST(1)							   Tokyo Cabinet							TCATEST(1)

NAME
tcamgr - the command line utility of the abstract database API DESCRIPTION
The command `tcamgr' is a utility for test and debugging of the abstract database API and its applications. `name' specifies the name of a database. `key' specifies the key of a record. `value' specifies the value of a record. `params' specifies the tuning parameters. `func' specifies the name of a function. `arg' specifies the arguments of the function. `dest' specifies the path of the destination file. tcamgr create name Create a database file. tcamgr inform name Print miscellaneous information to the standard output. tcamgr put [-sx] [-sep chr] [-dk|-dc|-dai|-dad] name key value Store a record. tcamgr out [-sx] [-sep chr] name key Remove a record. tcamgr get [-sx] [-sep chr] [-px] [-pz] name key Print the value of a record. tcamgr list [-sep chr] [-m num] [-pv] [-px] [-fm str] name Print keys of all records, separated by line feeds. tcamgr optimize name params Optimize a database file. tcamgr misc [-sx] [-sep chr] [-px] name func [arg...] Call a versatile function for miscellaneous operations. tcamgr map [-fm str] name dest Map records into another B+ tree database. tcamgr version Print the version information of Tokyo Cabinet. Options feature the following. -sx : the input data is evaluated as a hexadecimal data string. -sep chr : specify the separator of the input data. -dk : use the function `tcadbputkeep' instead of `tcadbput'. -dc : use the function `tcadbputcat' instead of `tcadbput'. -dai : use the function `tcadbaddint' instead of `tcadbput'. -dad : use the function `tcadbadddouble' instead of `tcadbput'. -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. -fm str : specify the prefix of keys. This command returns 0 on success, another on failure. SEE ALSO
tcatest(1), tcamttest(1), tcadb(3), tokyocabinet(3) Man Page 2011-02-12 TCATEST(1)
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