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Full Discussion: AIX to RHEL migration - awk treating 0e[0-9]+ as 0 instead of string issue
Top Forums Shell Programming and Scripting AIX to RHEL migration - awk treating 0e[0-9]+ as 0 instead of string issue Post 302997465 by MadeInGermany on Sunday 14th of May 2017 05:17:43 AM
Old 05-14-2017
awk has automatic type conversion.
The ! operator is a boolean that is rather a number (being 1 or 0) than a string, so there is a decent hint to treat the variable as a number.
In border cases there can be differences between awk versions. E.g. the awk in AIX is a derivate from nawk, where awk in Linux is mostly gawk, but some Linux have mawk that is again little different.
The bottom line is, make the data type clear, e.g. typical casts are
var "" append a null string, result is a string
var+0 add a zero, result is a number
This User Gave Thanks to MadeInGermany For This Post:
chill3chee
 

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LEARN ABOUT SUNOS

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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