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Top Forums Shell Programming and Scripting Search and replace particular characters in fixed length-file Post 302375235 by bittoo on Friday 27th of November 2009 04:38:22 AM
Old 11-27-2009
Search and replace particular characters in fixed length-file

Masters,
I have fixed length input file like
Code:
FHEAD0000000001XXXX20090901      0000009000Y1000XXX2
THEAD000000000220090901      ITM0000109393813            430143504352N22SP    000000000000RN000000010000EA  P0000000000000014390020090901      
TTAIL0000000003000000
FTAIL00000000040000000002

Note the fields in Bold Italicized.. These fields need to be replaced with variable in shell script( of same format YYYYMMDD ). I used cut command, but it is trimming the spaces between the fields.
How to I achieve this field replacement, without changing the length/ format of the file

---------- Post updated at 03:08 PM ---------- Previous update was at 03:07 PM ----------

Forogt to mention that I have to change only in FHEAD and THEAD records only in those positions.
 

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CUT(1)							    BSD General Commands Manual 						    CUT(1)

NAME
cut -- select portions of each line of a file SYNOPSIS
cut -b list [-n] [file ...] cut -c list [file ...] cut -f list [-d delim] [-s] [file ...] DESCRIPTION
The cut utility selects portions of each line (as specified by list) from each file and writes them to the standard output. If the file argument is a single dash ('-') or no file arguments were specified, lines are read from the standard input. The items specified by list can be in terms of column position or in terms of fields delimited by a special character. Column numbering starts from 1. list is a comma or whitespace separated set of increasing numbers and/or number ranges. Number ranges consist of a number, a dash (-), and a second number and select the fields or columns from the first number to the second, inclusive. Numbers or number ranges may be preceded by a dash, which selects all fields or columns from 1 to the first number. Numbers or number ranges may be followed by a dash, which selects all fields or columns from the last number to the end of the line. Numbers and number ranges may be repeated, overlapping, and in any order. It is not an error to select fields or columns not present in the input line. The options are as follows: -b list The list specifies byte positions. -c list The list specifies character positions. -d string Use the first character of string as the field delimiter character. The default is the <TAB> character. -f list The list specifies fields, separated by the field delimiter character. The selected fields are output, separated by the field delimiter character. -n Do not split multi-byte characters. -s Suppresses lines with no field delimiter characters. Unless specified, lines with no delimiters are passed through unmodified. EXIT STATUS
cut exits 0 on success, 1 if an error occurred. SEE ALSO
paste(1) STANDARDS
The cut utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). BSD
December 21, 2008 BSD
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