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Find Null values in Columns and fail execution by displaying error message

 
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Top Forums UNIX for Dummies Questions & Answers Find Null values in Columns and fail execution by displaying error message
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Old 04-08-2015
Two of your requirements (excluding headers and exit with code 16 if fields 2 or 3 are empty in a file) can be fulfilled easily with
Code:
awk     'function PR()  {print FILENAME, V?": Null values " V:": All records good."}

         FNR==1         {next}
         !$2            {V=102}
         !$3            {V=103}

         FNR==2 && NR>2 {PR(); if (V) exit 16}

        ' FS="," pf_[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9].csv

Unfortunately, awk doesn't know if it is operationg on the last line of a file, so we'd need to save each line and then check for FNR==1 (or the END condition). Try yourself and come back if you hit a brick wall.
 
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LEARN ABOUT FREEBSD

column

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

NAME

     column -- columnate lists

SYNOPSIS

     column [-tx] [-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.

     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.

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