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Top Forums UNIX for Dummies Questions & Answers Find Null values in Columns and fail execution by displaying error message Post 302940635 by tpk on Wednesday 8th of April 2015 01:39:55 AM
Old 04-08-2015
Linux

Hi Rudic,

Thank You Very much for providing an excellent solution. But there is a problem here, The reason why I am truncating Header and Trailer records is for header and trailer records for column 2 or Column 3 we may get null values.

So in your awk function though the actual data I am interested in doesn't have any null values excluding header and trailer in the file it is displaying Null Values message as the trailer record has null values for column 2 and column 3.

Is there any way that you can tweak the function to exclude header and trailer and check the file.

I am sorry for this, I should have mentioned clearly initially only why I am excluding the Header and trailer records.

And your output is a bit confusing, My requirement is is there are 3 files, after processing 1st file if the function finds null values in second file then and there it should exit the function with out further processing and further processing next file also, and it seems by seeing your o/p if in first file it found null values then it is processing next files also.

And at this point after the function execution is completed if we do echo $?, the o/p will be always 0 which means the command is executed successfully, My requirement is if we find null values in 1st file itself then it should exit with 16 and should not process further files and when we do an echo $? the status should be printed as 16.


With Regards,
TPK.

Last edited by tpk; 04-08-2015 at 04:27 AM.. Reason: Updated with correct information
 

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COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME
column -- columnate lists SYNOPSIS
column [-entx] [-c columns] [-s sep] [file ...] DESCRIPTION
The column utility formats its input into multiple columns. Rows are filled before columns. Input is taken from file operands, or, by default, from the standard input. Empty lines are ignored unless the -e option is used. The options are as follows: -c Output is formatted for a display columns wide. -s Specify a set of characters to be used to delimit columns for the -t option. -t Determine the number of columns the input contains and create a table. Columns are delimited with whitespace, by default, or with the characters supplied using the -s option. Useful for pretty-printing displays. -x Fill columns before filling rows. -n By default, the column command will merge multiple adjacent delimiters into a single delimiter when using the -t option; this option disables that behavior. This option is a Debian GNU/Linux extension. -e Do not ignore empty lines. ENVIRONMENT
The COLUMNS, LANG, LC_ALL and LC_CTYPE environment variables affect the execution of column as described in environ(7). EXIT STATUS
The column utility exits 0 on success, and >0 if an error occurs. EXAMPLES
(printf "PERM LINKS OWNER GROUP SIZE MONTH DAY " ; printf "HH:MM/YEAR NAME " ; ls -l | sed 1d) | column -t SEE ALSO
colrm(1), ls(1), paste(1), sort(1) HISTORY
The column command appeared in 4.3BSD-Reno. BUGS
Input lines are limited to LINE_MAX (2048) bytes in length. BSD
July 29, 2004 BSD
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