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Top Forums Shell Programming and Scripting How to parse fixed-width columns which may include empty fields? Post 302680975 by ahsh79 on Thursday 2nd of August 2012 02:00:34 PM
Old 08-02-2012
How to parse fixed-width columns which may include empty fields?

I am trying to selectively display several columns from a db2 query, which gives me a fixed-width output (partial output listed here):
Code:
--------- -------------------------- ------------ ------
000       0000000000198012           702          29
000       0000000000198013                        29
000                                  702          29
000       0000000000198015           702          03
055       0000000000000001           702


I am trying to accomplish two things:
1. parsing each field from each column, even the ones that are blank
2. put a delimiter of ";" between each field

So expected output would be:

Code:
000;0000000000198012;702;29
000;0000000000198013;;29
000;;702;29
000;0000000000198015;702;03
055;0000000000000001;702;


This is my draft code, which works:
myquery | cut -c 1-9,11-48,60-68,112-142,143-159 --output-delimiter=";"

However my target system does not support any of the GNU utilities, so I cannot use the "output-delimiter" option with cut, or the "FIELDWIDTHS" option with gawk.

So how can I get the desired output, when there are blank fields in some columns?

Thanks in advance for your help!

Last edited by ahsh79; 08-02-2012 at 03:32 PM.. Reason: formatting
 

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cut(1)							      General Commands Manual							    cut(1)

Name
       cut - cut out selected fields of each line of a file

Syntax
       cut -clist [file1 file2...]
       cut -flist [-dchar] [-s] [file1 file2...]

Description
       Use  the  command to cut out columns from a table or fields from each line of a file.  The fields as specified by list can be fixed length,
       that is, character positions as on a punched card (-c option), or the length can vary from line to line and be marked with a  field  delim-
       iter character like tab (-f option).  The command can be used as a filter.  If no files are given, the standard input is used.

       Use to make horizontal ``cuts'' (by context) through a file, or to put files together in columns.  To reorder columns in a table, use and

Options
       list	   Specifies  ranges  that must be a comma-separated list of integer field numbers in increasing order.  With optional - indicates
		   ranges as in the -o option of nroff/troff for page ranges; for example, 1,4,7; 1-3,8; -5,10 (short for 1-5,10);  or	3-  (short
		   for third through last field).

       -clist	   Specifies character positions to be cut out.  For example, -c1-72 would pass the first 72 characters of each line.

       -flist	   Specifies  the  fields  to be cut out.  For example, -f1,7 copies the first and seventh field only.	Lines with no field delim-
		   iters are passed through intact (useful for table subheadings), unless -s is specified.

       -dchar	   Uses the specified character as the field delimiter.  Default is tab.  Space or other characters with special  meaning  to  the
		   shell must be quoted.  The -d option is used only in combination with the -f option, according to XPG3 and SVID2/SVID3.

       -s	   Suppresses  lines  with  no	delimiter  characters.	 Unless  specified, lines with no delimiters are passed through untouched.
		   Either the -c or -f option must be specified.

Examples
       Mapping of user IDs to names:
       cut -d: -f1,5 /etc/passwd
       To set name to the current login name for the csh shell:
       set name=`who am i | cut -f1 -d" "`
       To set name to the current login name for the sh, sh5, and ksh shells:
       name=`who am i | cut -f1 -d" "`

Diagnostics
       "line too long"	   A line can have no more than 511 characters or fields.

       "bad list for c/f option"
			   Missing -c or -f option or incorrectly specified list.  No error occurs if a line has fewer fields than the list  calls
			   for.

       "no fields"	   The list is empty.

See Also
       grep(1), paste(1)

																	    cut(1)
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