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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LEARN ABOUT PHP

str_ireplace

STR_IREPLACE(3) 							 1							   STR_IREPLACE(3)

str_ireplace - Case-insensitive version ofstr_replace(3).

SYNOPSIS

       mixed str_ireplace (mixed  $search, mixed  $replace, mixed  $subject, [int  &$count])

DESCRIPTION

	This  function	returns  a string or an array with all occurrences of $search in $subject (ignoring case) replaced with the given $replace
       value. If you don't need fancy replacing rules, you should generally use this function instead of preg_replace(3) with the i modifier.

PARAMETERS

	If $search and $replace are arrays, then str_ireplace(3) takes a value from each array and uses them to search and replace on $subject. If
       $replace  has  fewer  values  than  $search,  then  an  empty string is used for the rest of replacement values. If $search is an array and
       $replace is a string, then this replacement string is used for every value of $search. The converse would not make sense, though.

	If $search or $replace are arrays, their elements are processed first to last.

	      o $search
		- The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles.

	      o $replace
		- The replacement value that replaces found $search values. An array may be used to designate multiple replacements.

	      o $subject
		- The string or array being searched and replaced on, otherwise known as the haystack.	If $subject is an array, then  the  search
		and replace is performed with every entry of $subject, and the return value is an array as well.

	      o $count
		- If passed, this will be set to the number of replacements performed.

RETURN VALUES

	Returns a string or an array of replacements.

EXAMPLES

       Example #1

	      str_ireplace(3) example

	      <?php
	      $bodytag = str_ireplace("%body%", "black", "<body text=%BODY%>");
	      ?>

NOTES

       Note

	      This function is binary-safe.

       Caution

	      Replacement order gotcha

	       Because	str_ireplace(3)  replaces  left  to  right, it might replace a previously inserted value when doing multiple replacements.
	      Example #2 in the str_replace(3) documentation demonstrates how this may affect you in practice.

SEE ALSO

       str_replace(3), preg_replace(3), strtr(3).

PHP Documentation Group 													   STR_IREPLACE(3)