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Top Forums UNIX for Beginners Questions & Answers How to assign a value to a variable in awk scripting? Post 303038209 by Don Cragun on Tuesday 27th of August 2019 08:47:55 PM
Old 08-27-2019
Quote:
Originally Posted by bhagya123
Thanks..Actually i tried with substr and it was working..

Later i encountered an error and thought that is related to to the substr function. But looks like it caused by something else.

Thanks for the response !!

--- Post updated at 07:33 PM ---

Similar to that I am also trying an awk array and wanted to check if the array value match string "{5:{" , replace with 5: and assign it back to same array and print it.

But below code is not working its not able to replace the array value , instead its assigning whole command to msg_arr[i] and printing it

any solution for this?

Code:
              for (i=msgtkn_20_lnno; i<msg_lnno;)
              {
                if(msg_arr[i]  ~ /^{5:{/ )
                {
                tag5_before_value= msg_arr[i];
               msg_arr[i]="echo $tag5_before_value | sed 's/{5:{/5:/g'";
                printf "after conversion is %s/n", abc > "LOG.txt";
               print msg_arr[i++];
               }
                else
                {
                  print msg_arr[i++];
                }

              }

as soon as i use "`" its giving me syntax error
Moderator's Comments:
Mod Comment Please do not use two threads to discuss one topic.

Please do not use one thread to discuss two topics. The second topic in this thread is already being discussed in the thread sed inside the awk script to replace a string in the array. Do not continue that discussion here!
 

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SUBSTR_REPLACE(3)							 1							 SUBSTR_REPLACE(3)

substr_replace - Replace text within a portion of a string

SYNOPSIS
mixed substr_replace (mixed $string, mixed $replacement, mixed $start, [mixed $length]) DESCRIPTION
substr_replace(3) replaces a copy of $string delimited by the $start and (optionally) $length parameters with the string given in $replace- ment. PARAMETERS
o $string - The input string. An array of strings can be provided, in which case the replacements will occur on each string in turn. In this case, the $replacement, $start and $length parameters may be provided either as scalar values to be applied to each input string in turn, or as arrays, in which case the corresponding array element will be used for each input string. o $replacement - The replacement string. o $start - If $start is positive, the replacing will begin at the $start'th offset into $string. If $start is negative, the replacing will begin at the $start'th character from the end of $string. o $length - If given and is positive, it represents the length of the portion of $string which is to be replaced. If it is negative, it rep- resents the number of characters from the end of $string at which to stop replacing. If it is not given, then it will default to strlen( $string ); i.e. end the replacing at the end of $string. Of course, if $length is zero then this function will have the effect of inserting $replacement into $string at the given $start offset. RETURN VALUES
The result string is returned. If $string is an array then array is returned. EXAMPLES
Example #1 Simple substr_replace(3) examples <?php $var = 'ABCDEFGH:/MNRPQR/'; echo "Original: $var<hr /> "; /* These two examples replace all of $var with 'bob'. */ echo substr_replace($var, 'bob', 0) . "<br /> "; echo substr_replace($var, 'bob', 0, strlen($var)) . "<br /> "; /* Insert 'bob' right at the beginning of $var. */ echo substr_replace($var, 'bob', 0, 0) . "<br /> "; /* These next two replace 'MNRPQR' in $var with 'bob'. */ echo substr_replace($var, 'bob', 10, -1) . "<br /> "; echo substr_replace($var, 'bob', -7, -1) . "<br /> "; /* Delete 'MNRPQR' from $var. */ echo substr_replace($var, '', 10, -1) . "<br /> "; ?> Example #2 Using substr_replace(3) to replace multiple strings at once <?php $input = array('A: XXX', 'B: XXX', 'C: XXX'); // A simple case: replace XXX in each string with YYY. echo implode('; ', substr_replace($input, 'YYY', 3, 3))." "; // A more complicated case where each replacement is different. $replace = array('AAA', 'BBB', 'CCC'); echo implode('; ', substr_replace($input, $replace, 3, 3))." "; // Replace a different number of characters each time. $length = array(1, 2, 3); echo implode('; ', substr_replace($input, $replace, 3, $length))." "; ?> The above example will output: A: YYY; B: YYY; C: YYY A: AAA; B: BBB; C: CCC A: AAAXX; B: BBBX; C: CCC NOTES
Note This function is binary-safe. SEE ALSO
str_replace(3), substr(3), String access and modification by character. PHP Documentation Group SUBSTR_REPLACE(3)
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