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Full Discussion: Replace Value of nth Column of Each Line Using Array
Top Forums Shell Programming and Scripting Replace Value of nth Column of Each Line Using Array Post 303014081 by Don Cragun on Sunday 4th of March 2018 08:43:58 PM
Old 03-04-2018
Quote:
Originally Posted by abdulbadii
Code:
awk  'NR==FNR { a[$1]=$4; next } {if ($2 == a[array1]) $2=a[array2] }' FS=,={} arrayfile FS=, inputfile

Hi abdulbadii,
Would you please explain how the above script is supposed to do something related to the topic of this thread?

If I slightly modify your script to add a debugging statement showing how the array a is set:
Code:
awk  '
NR==FNR {
	a[$1]=$4
	printf("a[%s] has been set to \"%s\"\n", $1, $4)
	next
}
{	if ($2 == a[array1])
		$2=a[array2]
}
' FS=,={} arrayfile FS=, inputfile

it produces the output:
Code:
a[Array1={A, B, C}] has been set to ""
a[Array2= {U09, C04, A054}] has been set to ""

when the arrayfile and inputfile files contain the data shown in post #1 in this thread.

Note that since neither of the awk variables array1 and array2 have been set, the if statement will never find a match. And, even if a match were found and the 2nd field was changed to an empty string by the assignment, what difference would it make? There is nothing in this awk script that produces any output.

Note also that using the fixed string =,={} as a field separator for the 1st input file seems strange since that string is never found in either of your input files. That means that each line will be field #1 for that line and field $4 in each line will be an empty string (which is exactly what we see from the added debugging statement).
 

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LEARN ABOUT SUSE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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