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
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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JRUBY(1)							       LOCAL								  JRUBY(1)

NAME
jruby -- Interpreted object-oriented scripting language SYNOPSIS
jruby [--copyright] [--version] [-Sacdlnpswvy] [-0[octal]] [-C directory] [-F pattern] [-I directory] [-K c] [-T[level]] [-e command] [-i[extension]] [-r library] [-x[directory]] [--] [program_file] [argument ...] DESCRIPTION
Jruby is a 100% pure-Java implementation of Ruby, an interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). It is simple, straight-forward, and extensible. OPTIONS
Ruby interpreter accepts following command-line options (switches). They are quite similar to those of perl(1). --copyright Prints the copyright notice. --version Prints the version of Ruby interpreter. -0[octal] (The digit ``zero''.) Specifies the input record separator ($/) as an octal number. If no digit is given, the null character is taken as the separator. Other switches may follow the digits. -00 turns Ruby into paragraph mode. -0777 makes Ruby read whole file at once as a single string since there is no legal character with that value. -C directory Causes Ruby to switch to the directory. -F pattern Specifies input field separator ($;). -I directory Used to tell Ruby where to load the library scripts. Directory path will be added to the load-path variable ($:). -K kcode Specifies KANJI (Japanese) encoding. -S Makes Ruby use the PATH environment variable to search for script, unless if its name begins with a slash. This is used to emulate #! on machines that don't support it, in the following manner: #! /usr/local/bin/ruby # This line makes the next one a comment in Ruby exec /usr/local/bin/ruby -S $0 $* -T[level] Turns on taint checks at the specified level (default 1). -a Turns on auto-split mode when used with -n or -p. In auto-split mode, Ruby executes $F = $_.split at beginning of each loop. -c Causes Ruby to check the syntax of the script and exit without executing. If there are no syntax errors, Ruby will print ``Syntax OK'' to the standard output. -d --debug Turns on debug mode. $DEBUG will be set to true. -e command Specifies script from command-line while telling Ruby not to search the rest of arguments for a script file name. -h --help Prints a summary of the options. -i extension Specifies in-place-edit mode. The extension, if specified, is added to old file name to make a backup copy. For example: % echo matz > /tmp/junk % cat /tmp/junk matz % ruby -p -i.bak -e '$_.upcase!' /tmp/junk % cat /tmp/junk MATZ % cat /tmp/junk.bak matz -l (The lowercase letter ``ell''.) Enables automatic line-ending processing, which means to firstly set $ to the value of $/, and secondly chops every line read using chop!. -n Causes Ruby to assume the following loop around your script, which makes it iterate over file name arguments somewhat like sed -n or awk. while gets ... end -p Acts mostly same as -n switch, but print the value of variable $_ at the each end of the loop. For example: % echo matz | ruby -p -e '$_.tr! "a-z", "A-Z"' MATZ -r library Causes Ruby to load the library using require. It is useful when using -n or -p. -s Enables some switch parsing for switches after script name but before any file name arguments (or before a --). Any switches found there are removed from ARGV and set the corresponding variable in the script. For example: #! /usr/local/bin/ruby -s # prints "true" if invoked with `-xyz' switch. print "true " if $xyz On some systems $0 does not always contain the full pathname, so you need the -S switch to tell Ruby to search for the script if necessary. To handle embedded spaces or such. A better construct than $* would be ${1+"$@"}, but it does not work if the script is being interpreted by csh(1). -v --verbose Enables verbose mode. Ruby will print its version at the beginning, and set the variable $VERBOSE to true. Some methods print extra messages if this variable is true. If this switch is given, and no other switches are present, Ruby quits after printing its version. -w Enables verbose mode without printing version message at the beginning. It sets the $VERBOSE variable to true. -x[directory] Tells Ruby that the script is embedded in a message. Leading garbage will be discarded until the first that starts with ``#!'' and contains the string, ``ruby''. Any meaningful switches on that line will applied. The end of script must be spec- ified with either EOF, ^D (control-D), ^Z (control-Z), or reserved word __END__. If the directory name is specified, Ruby will switch to that directory before executing script. -y --yydebug Turns on compiler debug mode. Ruby will print a bunch of internal state messages during compiling scripts. You don't have to specify this switch, unless you are going to debug the Ruby interpreter. UNIX
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