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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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ucblinks(1B)					     SunOS/BSD Compatibility Package Commands					      ucblinks(1B)

NAME
ucblinks - adds /dev entries to give SunOS 4.x compatible names to SunOS 5.x devices SYNOPSIS
/usr/ucb/ucblinks [-e rulebase] [-r rootdir] DESCRIPTION
ucblinks creates symbolic links under the /dev directory for devices whose SunOS 5.x names differ from their SunOS 4.x names. Where possi- ble, these symbolic links point to the device's SunOS 5.x name rather than to the actual /devices entry. ucblinks does not remove unneeded compatibility links; these must be removed by hand. ucblinks should be called each time the system is reconfiguration-booted, after any new SunOS 5.x links that are needed have been created, since the reconfiguration may have resulted in more compatibility names being needed. In releases prior to SunOS 5.4, ucblinks used a nawk rule-base to construct the SunOS 4.x compatible names. ucblinks no longer uses nawk for the default operation, although nawk rule-bases can still be specifed with the -e option. The nawk rule-base equivalent to the SunOS 5.4 default operation can be found in /usr/ucblib/ucblinks.awk. OPTIONS
-e rulebase Specify rulebase as the file containing nawk(1) pattern-action statements. -r rootdir Specify rootdir as the directory under which dev and devices will be found, rather than the standard root directory /. FILES
/usr/ucblib/ucblinks.awk sample rule-base for compatibility links ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
devlinks(1M), disks(1M), ports(1M), tapes(1M), attributes(5) SunOS 5.10 13 Apr 1994 ucblinks(1B)
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