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Full Discussion: Help with nawk (Exact Match)
Top Forums Shell Programming and Scripting Help with nawk (Exact Match) Post 302927820 by Don Cragun on Friday 5th of December 2014 05:42:19 PM
Old 12-05-2014
Quote:
Originally Posted by migurus
Would anyone care to explain the syntax in

Code:
/usr/bin/nawk -v ip="${IP}" '$0~(ip "$"),printed==6 { ++printed; print; }' abcxyz

I don't understand the comma after comparison operator (marked it with red above) Thanks!
For each set of lines starting with a line where ip appears at the end of the line through the next line where printed has the value 6, increment printed and print the line.

This construct is more frequently seen when matching a range of patterns:
Code:
/x/,/y/ {print}

or a range of line numbers:
Code:
3,5 {print}

but there is nothing in the awk specification that restricts the conditions used to specify the comma separated start and end points of the range.
This User Gave Thanks to Don Cragun For This Post:
migurus
 

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LEARN ABOUT BSD

ucblinks

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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