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Extract error records based on specific criteria from Unix file

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# 1  
Old 07-12-2012
Extract error records based on specific criteria from Unix file


I look for a awk one liner for below issue.

input file

ABC 1234 abc 12345
ABC 4567 678 XYZ
xyz ght 678
ABC 787 yyuu
ABC 789 7890 777
zxr hyip hyu
mno uii 678 776
ABC ty7 888

All lines should be started with ABC as first field. If a record has another value for 1st field, the previuos record with ABC also an error record. I need to get the output as below

ABC 4567 678 XYZ
xyz ght 678
ABC 789 7890 777
zxr hyip hyu
mno uii 678 776

i have written a code by using while ... do ... done. but for bigger files this takes lot of time as this code reads file record by record.
Please help.

# 2  
Old 07-12-2012
I think your O/P and the explanation doesn't match Smilie
# 3  
Old 07-12-2012
i have written a code by using while ... do ... done

post your code.......
# 4  
Old 07-12-2012
you can use this perl code

$ cat
#!/usr/bin/perl -w
use strict;
chomp(my @arr=<>);
my $i=0;
for (@arr)
        if (!/^ABC/)
                my $x=$i-1;
                print "Line ".$i.":".$arr[$x]."\n";
                print "Line ".($i+1).":".$_."\n";

while runing this code, club it with sort -u

$ ./ a.txt| sort -u

Line 2:ABC 4567 678 XYZ
Line 3:xyz ght 678
Line 5:ABC 789 7890 777
Line 6:zxr hyip hyu
Line 7:mno uii 678 776

# 5  
Old 07-12-2012
My code for this

My requirement is extract error records. Output shows error records.

My code is

cat input_file | while read line
typ=`echo "$line" | cut -c 1-3`
if [ $cnt -gt 1 ]
if [ typ != "ABC" ] || [ pre_typ != "ABC" ]
echo $pre_line >> output_file
cnt = 2
if [ typ != "ABC" ] || [ pre_typ != "ABC" ]
echo $pre_line >> output_file

Please give me a better logic.
# 6  
Old 07-12-2012
I don't understand what you mean by extract error records,
my code is giving the exact output you wanted (as mentioned in your post)
if you want the output in a file you can just direct the output towards one

$ ./ a.txt| sort -u > ErrorFile.txt

# 7  
Old 07-13-2012
$awk '$1 ~ /ABC/{if(x ~/ABC/){print $0};x=$1}($1 !~ /ABC/){x=$1;print}'  inputfile

Last edited by raj_saini20; 07-13-2012 at 11:19 AM..

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