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Full Discussion: Searching max
Top Forums Shell Programming and Scripting Searching max Post 302860323 by Don Cragun on Saturday 5th of October 2013 03:38:44 PM
Old 10-05-2013
Quote:
Originally Posted by RudiC
@CarloM: I think he/she wanted the maxoct4 of all lines with maxoct3. If there were a line e.g. x.x.21.238 BEFORE maxoct3, that awk would print xxx.xxx.25.238, which is not contained in the input file.
RudiC,
You're obviously correct. But, we could use CarloM's approach to the problem to avoid the need to sort the input:
Code:
awk -F '[.]' '
$3 > m3 {m3 = $3; m4 = $4; next}
$3 == m3 && $4 > m4 {m4 = $4}
END {print "xxx.xxx." m3 "." m4}
' num1

As always, if someone wants to try this on a Solaris/SunOS system, they need to use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of awk.
This User Gave Thanks to Don Cragun For This Post:
 

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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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