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Full Discussion: Script to validate file header and trailer
Top Forums Shell Programming and Scripting Script to validate file header and trailer Post 302669279 by agama on Tuesday 10th of July 2012 08:21:02 PM
Old 07-10-2012
Quote:
Originally Posted by ash_sh
Equally important requirement is to verify record count matches in detail line and the record count sum in the trailer. How can this be done?
The awk programme that I posted and a small bug -- didn't properly check for multiple trailers. This does better:

Code:
awk -F "|" ' /^HDR/ { h++; next; } /^TRL/ {t++; next} END { exit( (h != 1) || t != 1 || $NF != NR - 2 ); }' input-file

It checks both for the existence of exactly one header and one trailer, AND checks that the record count in the trailer matches the records observed. If either fails the exit code is non-zero to indicate that there is an error. If you need more precision, knowing exactly why there is an error, a longer programme can be used:

Code:
awk -F "|" '
/^HDR/ { h++; next; }
/^TRL/ { t++; next; }
END {
    ec = 1;
    if( h != 1 || t != 1 )
        printf( "header/trailer count error: %d headers; %d trailers\n", h, t ) >"/dev/fd/2";
    else
        if( $NF != NR - 2 )
            printf( "bad record count: %d(t) != %d(rec)\n", $NF, NR ) >"/dev/fd/2";
        else
            ec = 0;
    exit( ec );
}' input-file

I am not familiar with what an 'ETL program' is, so I don't know if you can invoke awk or not.

If ETL is anything like and of the standard *NIX shells, you probably can do something like this:

Code:
if ! awk -F "|" ' /^HDR/ { h++; next; } /^TRL/ {t++; next} END { exit( (h != 1) || t != 1 || $NF != NR - 2 ); }' $file_name
then
   echo "file did not pass verification test: $file_name"
   exit 1
fi

# put rest of your processing on success here.

@chedlee88-1 -- for small files, reading each three times might not have a noticeable impact, but if the input being verified is large, reading each three times might be so inefficient as not to be practical. It makes more sense to read the file once.

This programme will do the same thing, non-zero exit code, and write the failure reason onto standard err.
 

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LEARN ABOUT HPUX

uuencode

uuencode(4)						     Kernel Interfaces Manual						       uuencode(4)

NAME

       uuencode - format of an encoded uuencode file

DESCRIPTION

       Files  output  by consist of a header line followed by a number of body lines, and a trailer line.  The command ignores any lines preceding
       the header or following the trailer (see uuencode(1)).  Lines preceding a header must not look like a header.

       The header line consists of the word followed by a space, a mode (in octal), another space, and a string which specifies the  name  of  the
       remote file.

       The  body  consists  of	a number of lines, each containing 62 or fewer characters (including trailing new-line).  These lines consist of a
       character count, followed by encoded characters, followed by a newline.

       The character count is a single printing character, which represents an integer.  This integer is the number of bytes in the  rest  of  the
       line, and always ranges from 0 to 63.  The byte count can be determined by subtracting the equivalent octal value of an ASCII space charac-
       ter (octal 40) from the character.

       Groups of 3 bytes are stored in 4 characters, 6 bits per character.  All are offset by a space to make the characters printable.  The  last
       line may be shorter than the normal 45 bytes.  If the size is not a multiple of 3, this fact can be determined by the value of the count on
       the last line.  Extra meaningless data will be included, if necessary, to make the character count a multiple of 4.  The body is terminated
       by a line with a count of zero.	This line consists of one ASCII space.

       The trailer line consists of the word on a line by itself.

SEE ALSO

       mail(1), uuencode(1), uucp(1).

																       uuencode(4)
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