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10.17.2007 at 06:27AM PDT, ID: 22898819
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6.6

Trying to replace characters in a text file by position on line (not pattern or delimiter) in unix shell scripting

Asked by Nikola_Novak in KornShell (ksh), Unix Systems Programming, Regular Expressions

Tags: , , , ,

I am trying to develop a shell script on AIX 5.3.5 / ksh or ksh93, which will take a text file with fixed-length rows ('records'), and on each row replace certain characters, based on position, with spaces.
For example, I may want to replace characters 450 through 470 with 20 blank spaces.

Problem I've encountered is that most unix utilities are based on delimited fields, not position-defined fields. I've tried to cludge it in with regexes:
CTC_PS_BLANKCMD="sed s/^\(.\{$CTC_PS_BEG\}\)\(.\{$CTC_PS_LEN\}\)/\1$CTC_PS_SPACER/ $CTC_PS_SOURCE"

(where CTC_PS_BEG is the first character to be replaced, CTC_PS_LEN is the length, CTC_PS_SPACER is the string with spaces, and CTC_PS_SOURCE is the input file).
However, two problems: no matter how I play with quotes, interpreter/shell changes the number of spaces to single; more over, it only works for characters up to 255, because of AIX limit of RC_MAX_DUP which I cannot change - it only allows up to 255 matches of a regular expression.

What is the best way I can create a command that will replace characters based on position?Start Free Trial
[+][-]10.17.2007 at 06:35AM PDT, ID: 20093089

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[+][-]10.17.2007 at 06:45AM PDT, ID: 20093186

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[+][-]10.17.2007 at 06:47AM PDT, ID: 20093195

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[+][-]10.17.2007 at 06:53AM PDT, ID: 20093272

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[+][-]10.17.2007 at 06:57AM PDT, ID: 20093313

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[+][-]10.17.2007 at 07:03AM PDT, ID: 20093403

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[+][-]10.17.2007 at 07:03AM PDT, ID: 20093406

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[+][-]10.17.2007 at 07:07AM PDT, ID: 20093469

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[+][-]10.17.2007 at 07:22AM PDT, ID: 20093619

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[+][-]10.17.2007 at 07:28AM PDT, ID: 20093691

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[+][-]10.17.2007 at 09:50AM PDT, ID: 20095000

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About this solution

Zones: KornShell (ksh), Unix Systems Programming, Regular Expressions
Tags: replace, file, text, character, position
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Solution Provided By: ahoffmann
Participating Experts: 3
Solution Grade: A
 
 
[+][-]10.17.2007 at 10:38AM PDT, ID: 20095390

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[+][-]10.17.2007 at 11:34AM PDT, ID: 20095828

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[+][-]10.17.2007 at 11:37AM PDT, ID: 20095849

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