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Full Discussion: Accessing awk array from shell
Top Forums Shell Programming and Scripting Accessing awk array from shell Post 302228131 by bateman23 on Saturday 23rd of August 2008 02:51:15 AM
Old 08-23-2008
Accessing awk array from shell
Hi,
i want awk to read a file and place it's content into two arrays. When trying to read these arrays with a "for a in ${source_path[@]} "-Loop it gives the right result. But when trying to access directly (/bin/echo ${source_path[0]}) it doesn't work.

I read "all "the awk threads in this forum and came to two solutions, which both don't work in the desired way. Is there any other way to pass an array from awk back to the shell script? Or what's wrong with my solutions so far?

Any help is appreciated. Thanks in advance, Daniel

First try:
Code:
#!/bin/sh

declare -a source_path
declare -a target_path

source_path=`awk -F';' '{print $1}' backup_path`
target_path=`awk -F';' '{print $2}' backup_path`

# getting the right values
/bin/echo "Sources"
for a in ${source_path[@]} 
do
/bin/echo $a
done

/bin/echo "Target"
for a in ${target_path[@]} 
do
/bin/echo $a
done

#getting the wrong values  concatenated
/bin/echo ${source_path[0]} 
/bin/echo ${target_path[0]}

Also wrong:
Code:
awk -F';' '{ source_path[NR] = $1 } END { print source_path[1]; }' backup_path

/bin/echo ${source_path[0]}

File, to parse:
Code:
/Users/daniel/Documents/Test;/Volumes/Backup/auto/Test;
/Users/daniel/Documents/Test3;/Volumes/Backup/auto/Test3;
/Users/daniel/Documents/Test2;/Volumes/Backup/auto/Test2;

 

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LEARN ABOUT SUNOS

echo

echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME

       echo - echo arguments to standard output

SYNOPSIS

       /usr/ucb/echo [-n] [argument]

DESCRIPTION

       echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output.

       echo  is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi-
       ronment variables.

       For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows:

	 o  echo your current-working-directory's full pathname

	 o  pipe the output through tr to translate the path's embedded slash-characters into space-characters

	 o  pipe that output through wc -w for a count of the names in your path.

	      example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w"

       See tr(1) and wc(1) for their functionality.

       The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be  invoked	if
       the  user  calls  echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape
       characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the  black-slashed  escape  characters,	and  ksh's
       echo() also understands a as the audible bell character; however, these commands do not have an -n option.

OPTIONS

       -n	Do not add the NEWLINE to the output.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), echo(1), ksh(1), sh(1), tr(1),  wc(1), attributes(5)

NOTES

       The -n option is a transition aid for BSD applications, and may not be supported in future  releases.

SunOS 5.10							    3 Aug 1994								  echo(1B)
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