Sponsored Content
Top Forums Shell Programming and Scripting Strange behaviour of arrays in awk Post 302852345 by ripat on Wednesday 11th of September 2013 10:25:28 AM
Old 09-11-2013
Strange behaviour of arrays in awk

Imagine 2 files f1 f2:

Code:
file1_l1_c1 code_to_find file1_l1_c3
file1_l2_c1 file1_code2 file1_l2_c3
file1_l3_c1 file1_code3 file1_l3_c3

Code:
file2_l1_c1 file2_l1_c2 code_to_find
file2_l2_c1 file2_l2_c2 file2_code5
file2_l3_c1 file2_l3_c2 file2_code3

Say we want to print lines from f2 having "code_to_find" as $3. I go the classical way with a
Code:
FNR == NR && /file1_l1/ {
	code[$2] = 1
	next
}

code[$3] {
	print
}

As expected the output is: file2_l1_c1 file2_l1_c2 code_to_find

Now, if I print the code[] array in the END block:END{ for (i in code) print "code[" i "]=" code[i]}

I would have expected that block to produce the only code[index] with a value i.e. code[code_to_find]=1

But to my great surprise, it returns this:
Code:
code[file1_l3_c3]=
code[code_to_find]=1
code[file2_code3]=
code[file1_l2_c3]=
code[file2_code5]=

How come that awk assigns the NULL value to the array with $3 from all files as index? Kind of weird to me.
 

9 More Discussions You Might Find Interesting

1. Linux

/etc/passwd strange behaviour!

Hi there, first of all, here is my conf of a uname -a Linux SAMBA 2.4.18-4GB #1 Wed Mar 27 13:57:05 UTC 2002 i686 unknown on a fedora machine. Here is my problem: every once in a while, the line containing root disappears in the /etc/passwd, disabling all logging on my server. Any one have... (0 Replies)
Discussion started by: penguin-friend
0 Replies

2. Shell Programming and Scripting

A Strange Behaviour!!!

Can some-one give me a view to this : I have a directory in an unix server, having permissions r-xr-xr-x .This directory is basically a source directory. Now there is another directory basically the destination directory which has all the permissions. Note:I log in as not the owner,but user... (5 Replies)
Discussion started by: navojit dutta
5 Replies

3. UNIX for Advanced & Expert Users

Strange sed behaviour

$ echo a.bc | sed -e "s/\|/\\|/g" |a|.|b|c| $ Is the behavior of the sed statement expected ? Or is this a bug in sed ? OS details Linux 2.6.9-55.0.0.0.2.ELsmp #1 SMP Wed May 2 14:59:56 PDT 2007 i686 i686 i386 GNU/Linux (8 Replies)
Discussion started by: vino
8 Replies

4. UNIX for Dummies Questions & Answers

Strange Program behaviour

Had a strange thing going on with my code. It's ok I figured it out for myself.... (2 Replies)
Discussion started by: mrpugster
2 Replies

5. Shell Programming and Scripting

strange behaviour from sed???

Hi all, I want to do a very simple thing with sed. I want to print out the line number of a disk I have defined in /etc/exports, so I do: It's all good, but here's the problem. When I define md0 in a variable, I get nothing from sed: Why is that? can anybody please help? Thanks (2 Replies)
Discussion started by: alirezan
2 Replies

6. HP-UX

Strange login behaviour

Hi all, I am using HP-UX and I have just noticed that when I log into the network it seems to save the previous windows that were subsequently closed on previous occasions. Does anyone know when I log in, it seems to display these previous windows, e.g. nedit windows open again? Does... (1 Reply)
Discussion started by: cyberfrog
1 Replies

7. Red Hat

Crontab strange behaviour

Hi all, I'm having this scenario which for the moment I cannot resolve. :( I wrote a script to make a dump/export of the oracle database. and then put this entry on crontab to be executed daily for example. The script is like below: cat /home/oracle/scripts/db_backup.sh #!/bin/ksh ... (3 Replies)
Discussion started by: enux
3 Replies

8. UNIX for Dummies Questions & Answers

Strange behaviour when output to terminal vs file (awk)

Hi all ! I noticed something very weird. I have a large pipe delimited file (20 fields/3,000 records) that looks like that: AAA|BBB|11111|22222|...|($NF of record 1) CCC|DDD|33333|44444|...|($NF of record 2) CCC|DDD|55555|66666|...|($NF of record 3) For the lines with same 1st and 2nd... (3 Replies)
Discussion started by: beca123456
3 Replies

9. Shell Programming and Scripting

awk Strange behaviour in AIX

Can someone please explain the strange behaviour.. I was just trying a few things to learn awk.. in the below code when I start the braces in the same line, the output is as expected, when I start at next line, output is displayed twice. Please see the file, code I tried and output below. ... (2 Replies)
Discussion started by: Kulasekar
2 Replies
PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME
paps - UTF-8 to PostScript converter using Pango SYNOPSIS
paps [options] files... DESCRIPTION
paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves through the pango ft2 backend. OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below. --landscape Landscape output. Default is portrait. --columns=cl Number of columns output. Default is 1. Please notice this option isn't related to the terminal length as in a "80 culums terminal". --font=desc Set the font description. Default is Monospace 12. --rtl Do right to left (RTL) layout. --paper ps Choose paper size. Known paper sizes are legal, letter and A4. Default is A4. Postscript points Each postscript point equals to 1/72 of an inch. 36 points are 1/2 of an inch. --bottom-margin=bm Set bottom margin. Default is 36 postscript points. --top-margin=tm Set top margin. Default is 36 postscript points. --left-margin=lm Set left margin. Default is 36 postscript points. --right-margin=rm Set right margin. Default is 36 postscript points. --gutter-width=gw Set gutter width. Default is 40 postscript points. --help Show summary of options. --header Draw page header for each page. --markup Interpret the text as pango markup. --lpi Set the lines per inch. This determines the line spacing. --cpi Set the characters per inch. This is an alternative method of specifying the font size. --stretch-chars Indicates that characters should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops behaviour. AUTHOR
paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>. This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others). April 17, 2006 PAPS(1)
All times are GMT -4. The time now is 02:12 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy