Replace nulls with a value in a file Post: 302852121

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

GREPing for Nulls

I just had a filesystem / file corruption issue on my HSP's server due to disk capacity limits and fileswapping. I discovered that certain files got corrupted when fileswapping was not successful and they ended up with a string of control characters, or what I believe to be nulls, in them. Does...

2. Programming

Blanks vs: Nulls

I'm relatively new to Pro*C programming. In the following example: char name; EXEC SQL SELECT 'John Doe' INTO :name FROM DUAL; "John Doe" is in positions 0-7, blanks in 8-19, and a null in 20. I would really prefer the null to be in position 8 and I don't care what's after that. I wrote a...

3. Shell Programming and Scripting

Replacing nulls using sed

Hi, I am trying to replace nulls with spaces in every record of a '|' delimited file. I used this command - cat input.dat | sed 's/||/| |/g' > output But if a space appears twice '| | |' , then only the first null is getting replaced with a space. The second one remains as a null. I...

4. Shell Programming and Scripting

How to check Null values in a file column by column if columns are Not NULLs

Hi All, I have a table with 10 columns. Some columns(2nd,4th,5th,7th,8th and 10th) are Not Null columns. I'll get a tab-delimited file and want to check col by col and generate seperate error code for each col eg:102 if 2nd col value is NULL and 104 if 4th col value is NULL so on... I am a...

5. Shell Programming and Scripting

sort truncates line when they contain nulls

When I try to sort a file where some records contain nulls i.e. hex 00 the sort truncates the record when it reaches the null and writes message: "sort: warning: missing NEWLINE added at end of input file myfile" I'm assuming from this that the sort sees the null as a special character and...

6. Shell Programming and Scripting

replace nulls with whitespaces in a file

Hi, i have a file which contains data in fixed length. each row contains data of 10 characters fixed length. The data in the file appears like 4567782882 some times i may recieve dat less than fixed length of 10. in such a case i find nulls appended at the trailing spaces when i do a...

7. Red Hat

Counting columns in a delimited record with NULLs

I am trying to count the number of columns in a delimited flat file. The record is tab delimited. When I use the command wc -w, I am getting unexpected results when the record contains a NULL value. I believe it is because there is a "word" missing. The below example will return 4 words...

8. Shell Programming and Scripting

Script that Nulls Contents of Files

Ok, I'm stuck here with a plan to get what I need done completed. I want to use perl to produce a document. lets say the document will be a pdf document. Now, is there a way for me to put a tiny little code in that pdf document that can make the pdf file null itself if run on a non-unix...

9. UNIX for Beginners Questions & Answers

Remove or truncate trailing nulls from file

I want to remove from a file the trailing null characters (0x00) and stop doing so when a different byte is found (which should not be deleted), and either put the result to the same file or a different one. Any ideas?

LEARN ABOUT DEBIAN

dpkg-awk

DPKG-AWK(1)						      General Commands Manual						       DPKG-AWK(1)

NAME

       dpkg-awk - Utility to read a dpkg style db file

SYNOPSIS

       dpkg-awk [(-f|--file) filename] [(-d|--debug) ##] [(-s|--sort) list] [(-rs|--rec_sep) ??] '<fieldname>:<regex>' ... -- <out_fieldname> ..

DESCRIPTION

       dpkg-awk  Parses  a  dpkg status file (or other similarly formatted file) and outputs the resulting records.  It can use regex on the field
       values to limit the returned records, it can also be told which fields to output, and it can sort the matched fields.

OPTIONS

       -f filename
       --file filename
	      The file to parse.  The default is /var/lib/dpkg/status.

       -d [#]
       --debug [#]
	      Each time this is specified, it increased the debug level.

       -s field(s)
       --sort field(s)
	      A space or comma separated list of fields to sort on.

       -n field(s)
       --numeric field(s)
	      A space or comma separated list of fields that should be interpreted as numeric in value.

       -rs ??
       --rec_sep ??
	      Output this string at the end of each output paragraph.

       -h
       --help Display some help.

       fieldname
	      The fields from the file, that are matched with the regex given.	The fieldnames are case insensitive.

       out_fieldname
	      The fields from the file, that are output for each record.  If the first field listed begins with ^, then the list  of  fields  that
	      follows will NOT be output.

BUGS

       Be  warned  that  the author has only a shallow understanding of the dpkg packaging system, so there are probably tons of bugs in this pro-
       gram.

       This program comes with no warranties.  If running this program causes fire and brimstone to rain down upon the earth, you will be on  your
       own.

       This program accesses the dpkg database directly in places, querying for data that cannot be gotten via dpkg.

AUTHOR

       Adam Heath <doogie@debian.org>

DEBIAN
								 Debian Utilities						       DPKG-AWK(1)