Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Dropping Records for unknown reason in awk script

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Dropping Records for unknown reason in awk script
# 1  
Old 10-30-2009
Dropping Records for unknown reason in awk script
Hi,

I have written the following it is pretty sloppy but I don't see any reason why I should be losing 54 records from a 3.5 million line file after using it.

What I am doing:

I have a 3.5 million record file with about 80,000 records need a correction. They are missing the last data from an append because they didn't have a match. I need to insert defaulted data on these records. My script worked at intended, however I have 54 less output records than input records and I don't know why they were dropped.


Code:
#!/bin/ksh

myFile="${1}"
myOutput="${2}"

awk '{
 match_flag=substr($0,63,2);
 if (NR == 1) insert_data=substr($0,41,22);
 if (match_flag == "  ") {strt=substr($0,1,40); print strt insert_data "\ \ \ \ \ \ \ \ \ \ \ NM\ X";}
else print $0;}' "${myFile}" >> "${myOutput}"

Basically what I am doing is appending a long string a data to any records that are missing a value in position 3064-3065.

Since this file is soo large I can't really provide sample data but I'll attempt to reproduce a short version below.

Code:
INPUT:
0001  Ronald   McDonald  01 H81 0001256 0100111               V VEEEFKFS SP X
0002  Elmo     St. Elmo  02 H82 0089621  001  10 11 01 1      0000WWDFCWWSP X
0003  Cookie   Monster   01 H81 0887141    1  .  0   0  .  1  BBB000 QWFJSP X
0004  Tfer     Harris    04 H84 0985512 0000000000000000000000BBE00122933NM X
0005  Oscar    Grouche   03 H83 0364471                   110.VVMWEWGODWFDA X
0006  Dumb     Name      02 H82 0000233   111 00 1111 00000000F23202233FFDA X
0007  Butter   Face      04 H84 0014666 1111111111111111111111M012291122FDA X
0008  Ford     F150      01 H81 0000001 00111 110 110  0011 ..S1102234SSMSP X
0009  Bar      Foo       03 H83 7741668 0 1 0 1 0 1 0 1 0 1 0 P019441MEWEDA X
0010  ChoCho   Train     04 H84 0014669 1111111111111111111111POWA1224023OB X
0011  Stone    Stone     04 H84 0014566 1111111111111111111111M12301MANWEOB X
0012  Problem  Record    04 H84 0000000 

OUTPUT:
0001  Ronald   McDonald  01 H81 0001256 0100111               V VEEEFKFS SP X
0002  Elmo     St. Elmo  02 H82 0089621  001  10 11 01 1      0000WWDFCWWSP X
0003  Cookie   Monster   01 H81 0887141    1  .  0   0  .  1  BBB000 QWFJSP X
0004  Tfer     Harris    04 H84 0985512 0000000000000000000000BBE00122933NM X
0005  Oscar    Grouche   03 H83 0364471                   110.VVMWEWGODWFDA X
0006  Dumb     Name      02 H82 0000233   111 00 1111 00000000F23202233FFDA X
0007  Butter   Face      04 H84 0014666 1111111111111111111111M012291122FDA X
0008  Ford     F150      01 H81 0000001 00111 110 110  0011 ..S1102234SSMSP X
0009  Bar      Foo       03 H83 7741668 0 1 0 1 0 1 0 1 0 1 0 P019441MEWEDA X
0010  ChoCho   Train     04 H84 0014669 1111111111111111111111POWA1224023OB X
0011  Stone    Stone     04 H84 0014566 1111111111111111111111M12301MANWEOB X
0012  Problem  Record    04 H84 0000000 0000000000000000000000           NM X

File is fixed length no delimiters.
Last edited by mkastin; 11-02-2009 at 11:28 AM.. Reason: Fixing all examples and adujusting code to fit examples properly.
# 2  
Old 11-01-2009
Please Help!
# 3  
Old 11-01-2009
It would be helpful if you rewrote your example code to work on the sample input you provide. At the moment there is no way of knowing what you are expecting in position 3064. Although your assumption that it is two empty spaces may be at the root of your problem.

I also don't understand your print statement: -

Code:
print strt insert_data "\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 0NM\ X"

When I try: -

Code:
nawk ' BEGIN{
  print "\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 0NM\ X"
} '

I get: -

Code:
\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 0NM\ X

as my output not: -

Code:
0000000000000000000000NMX

My advise is scale down your example awk to work with your sample file and maybe someone will reply. Simply reposting the same request without changing it at all seems to be getting you nowhere.

Good luck
# 4  
Old 11-02-2009
Haha, wow, just realized how horrible my question was. Okay, I adjusted everything and it should hopefully be clearer now.

Code:
$ awk ' BEGIN{
  print "\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 0NM\ X"
} '
awk: cmd. line:1: warning: escape sequence `\ ' treated as plain ` '
                                    0NM X

This statement works fine for me, although the escape sequence isn't necessary.
# 5  
Old 11-02-2009
Is there a pattern for the missing records, e.g. at the end?
Since your output format is the same as the input, do
Code:
cmp -l infile outfile

Look for difference that doesn't look like your intended one. The expected difference is you replace blanks of input with fixed values on the output. Try to spot visually (or mechanically) the unintended differences.
# 6  
Old 11-02-2009
Another approach is to diff the input and output files and redirect the differences to a file. Then open the file and look to see why the matches in your awk fail for those lines. You can go to the character postions and confirm if the patterns you are trying to match are what you expect.Good luck
# 7  
Old 11-02-2009
Quote:
Originally Posted by binlib
Is there a pattern for the missing records, e.g. at the end?
Since your output format is the same as the input, do
Code:
cmp -l infile outfile

Look for difference that doesn't look like your intended one. The expected difference is you replace blanks of input with fixed values on the output. Try to spot visually (or mechanically) the unintended differences.
I ran a diff on the files and I got over 160,000 lines returned I couldn't tell from this what lines went missing or if there was a discernible pattern to them. What I could tell from the diff was that appending the data onto the records I wanted to did work. I don't know if some of these records disappeared or if it was other fully intact lines.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

SSH is failing due to unknown reason

Hi, I have setup keys between user1@server1 and user2@server2 however, the ssh is failing. server1 is Linux 3.10.0-514.6.2.el7.x86_64 #1 SMP whereas server2 is 5.10 Generic_150400-40 sun4v sparc sun4v I have checked port 22 to be open and keys to be correct. I also find the permissions... (3 Replies)
Discussion started by: mohtashims
3 Replies

2. Shell Programming and Scripting

awk to update unknown value in file using range of another

I am trying to use awk to update all the unknown values in $6 of file2, if the $4 value in file 2 is within the range of $1 of file1. If there is already a value in $6 other then unknown, it is skipped and the next line is processed. In my awk attempt below the final output is 6 tab-delimited... (6 Replies)
Discussion started by: cmccabe
6 Replies

3. Shell Programming and Scripting

Print Unknown Number of User Inputs in awk

Hello, I am new to awk and I am trying to figure out how to print an output based on user input. For example: ubuntu:~/scripts$ steps="step1, step2, step3" ubuntu:~/scripts$ echo $steps step1, step2, step3 I am playing around and I got this pattern that I want: ... (3 Replies)
Discussion started by: tattoostreet
3 Replies

4. UNIX for Advanced & Expert Users

Unix script seems to be momentarily creating child process for unknown reason

Hi, I have a unix script that basically has a while loop inside which it checks Oracle database for certain records. If it finds the records, it does some processing and then goes back to the while loop. If it doesnot find any matching records, then it sleeps for 30 seconds and then goes back to... (17 Replies)
Discussion started by: waavman
17 Replies

5. Shell Programming and Scripting

awk script for getting the selected records from a file.

Hello, I have attached one file named file.txt . I have to create a file using the awk script with the records in which 38th position is P and not V . ex it should have 00501 HOLTSVILLE NYP00501 and it should not include 00501 I R S SERVICE CENTER ... (3 Replies)
Discussion started by: sonam273
3 Replies

6. Linux

Need awk script for removing duplicate records

I have log file having Traffic line 2011-05-21 15:11:50.356599 TCP (6), length: 52) 10.10.10.1.3020 > 10.10.10.254.50404: 2011-05-21 15:11:50.652739 TCP (6), length: 52) 10.10.10.254.50404 > 10.10.10.1.3020: 2011-05-21 15:11:50.652558 TCP (6), length: 89) 10.10.10.1.3020 >... (1 Reply)
Discussion started by: Rastamed
1 Replies

7. Linux

Need awk script for removing duplicate records

I have huge txt file having millions of trade data. For e.g Trade.txt (first 8 lines in the file is header info) COB_DATE,TRADE_ID,SOURCE_SYSTEM_TRADE_ID,TRADE_GROUP_ID, TRADE_TYPE,DEALER_NAME,EXTERNAL_COUNTERPARTY_ID, EXTERNAL_COUNTERPARTY_NAME,DB_COUNTERPARTY_ID,... (6 Replies)
Discussion started by: nmumbarkar
6 Replies

8. Shell Programming and Scripting

Finding out how long a script runs for and exit reason.

I am running a daemon program that sends texts via a connected mobile phone. I run this daemon via CLI, and it loops a few commands (checking to see if there are any new texts). It runs perfectly, the problem is, when I leave this to run on my Ubuntu Desktop, and come back to it hours later it... (2 Replies)
Discussion started by: daydreamer
2 Replies

9. Shell Programming and Scripting

awk out an unknown column ?

I need a solution to awk out an unknown column. I am unable to say '{print $x}' because the location changes. I would like to find a perl or awk solution to this. I do not know either very well but am trying to delve deeper into both. I am looking for the version of pkg8 in this example. Please... (17 Replies)
Discussion started by: i9300
17 Replies

10. Shell Programming and Scripting

why my script stopped- any reason(urgent please)

Hi Friends, iam running some scripts, which are all off suddenly stopping. Can any one tell me the reason why it happend. Is there any reason to stop the scripts. Thanks Krishna. (1 Reply)
Discussion started by: krishna9
1 Replies
Login or Register to Ask a Question