sed inside the awk script to replace a string in the array Post: 303038213

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Top Forums UNIX for Beginners Questions & Answers sed inside the awk script to replace a string in the array Post 303038213 by Don Cragun on Tuesday 27th of August 2019 10:40:24 PM

08-27-2019

Registered User

OK.

First, use /usr/xpg4/bin/awk or nawk; not awk when you're using any Solaris/SunOS system. (I strongly recommend /usr/xpg4/bin/awk since it meets all of the POSIX standard's requirements.)

Second, while sed uses Basic Regular Expressions (BREs), awk uses Extended Regular Expressions (EREs). And, in EREs, the opening brace character ({) is special and needs to be escaped when you are looking for a literal opening brace character. The code rdrtx1 suggested may work on some systems, but is not portable and (according to the standards) produces undefined behavior.

Third, since you are looking for a single occurrence of the string {5:{, there is no need to use gsub() (which looks for and attempts to find and replace as many occurrences of a matching pattern as it can find).

Try this instead:

Code:

for (i=msgtkn_20_lnno; i<msg_lnno; i++) {
	if( msg_arr[i] ~ /^[{]5:[{]/ ) {
		sub("[{]5:[{]", "5:", msg_arr[i]);
	}
	print msg_arr[i];
}

Note that I also moved the i++ into the for statement instead of hiding the loop increment in your print statements and I moved the print statement out of both branches of the if statement so it is more obvious that the same print is needed whether or not a match is found.

Don Cragun

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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)