Script Optimization - large delimited file, for loop with many greps Post: 302517399

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Top Forums Shell Programming and Scripting Script Optimization - large delimited file, for loop with many greps Post 302517399 by verge on Tuesday 26th of April 2011 05:21:57 PM

04-26-2011

Registered User

Thanks again Corona ... I'm still having trouble with excluding - as a delimiter in

Code:

FS="[^a-zA-Z0-9\\_\\.\\/\\-\\ ]"
 
I've tried \\-, \-, -, '-'

---------- Post updated at 01:56 PM ---------- Previous update was at 01:52 PM ----------

Thanks again for your help ... the difference in processing time reduced greatly ... from almost 6 hours to 20 minutes ... for approx over 3 million lines in about 35K lines

---------- Post updated at 02:21 PM ---------- Previous update was at 01:56 PM ----------

I have a slightly different issue with delimiters. I've been isolating and replacing the delimiters with grep, cut and sed but I know there is a much better way to do this with awk or even perl.

In my file the token seperator can be any non-word character, however the line terminator will also be a non-word character (the rule dictates that these two characters must be different). To add to the issue, user entered fields can include non-word characters, as long as those characters aren't the ones used for the token/line seperators.

Code:

Example record
ISA�3213�part-number�address~GS�56756�control{number~ST�09898~
 
Into 
ISA|3213|part-number|address
GS|56756|control{number
ST|09898

I need to replace the token seperator � with a more standard delimiter like |
I need to replace line terminator ~ with line feed (0D0A)

However � and ~ change from record to record and there are thousands of them in a file. I've csplit the files such that each file has the same token/field seperator and line terminator.

Let me know if I can explain this more clearly!

verge

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LEARN ABOUT REDHAT

cut

CUT(1)									FSF								    CUT(1)

NAME

       cut - remove sections from each line of files

SYNOPSIS

       cut [OPTION]... [FILE]...

DESCRIPTION

       Print selected parts of lines from each FILE to standard output.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --bytes=LIST
	      output only these bytes

       -c, --characters=LIST
	      output only these characters

       -d, --delimiter=DELIM
	      use DELIM instead of TAB for field delimiter

       -f, --fields=LIST
	      output only these fields;  also print any line that contains no delimiter character, unless the -s option is specified

       -n     with -b: don't split multibyte characters

       -s, --only-delimited
	      do not print lines not containing delimiters

       --output-delimiter=STRING
	      use STRING as the output delimiter the default is to use the input delimiter

       --help display this help and exit

       --version
	      output version information and exit

       Use one, and only one of -b, -c or -f.  Each LIST is made up of one range, or many ranges separated by commas.  Each range is one of:

       N      N'th byte, character or field, counted from 1

       N-     from N'th byte, character or field, to end of line

       N-M    from N'th to M'th (included) byte, character or field

       -M     from first to M'th (included) byte, character or field

       With no FILE, or when FILE is -, read standard input.

AUTHOR

       Written by David Ihnat, David MacKenzie, and Jim Meyering.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The full documentation for cut is maintained as a Texinfo manual.  If the info and cut programs are properly installed at  your	site,  the
       command

	      info cut

       should give you access to the complete manual.

cut (coreutils) 4.5.3						   February 2003							    CUT(1)