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08-29-2001
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how to replace certain patterns in a file thru unix!!
Hi Friends,
well what i want to do is that suppose i have a file say like .... ronaldduckdancecoolman donaldmuckdancepooltactics fonaldguckdancetoolbutcomps .... okok i agree this is a ridiculous data for a file. :-) now i want that the characters in each line fromposition 16 to say 19 gets replaced by a particular string , in this case the charcters are cool pool and tool , so say i want is the follwoing output: .... ronaldduckdanceYYYYman donaldmuckdanceYYYYtactics fonaldguckdanceYYYYbutcomps .... or maybe it is possible that the case is that i want to replcae cool,tool and pool by word whose length is greate than the ones which are present say like .... ronaldduckdanceYYYYYYYYman donaldmuckdanceYYYYYYYYtactics fonaldguckdanceYYYYYYYYbutcomps .... and also suppose i want say that a particular word occurence in every line is replaced by some other word say like i have input file containing .... ronaldduckdanceYYYYman donaldmuckdanceYYYYtactics fonaldguckdanceYYYYbutcomps .... and i want the file to be manipulated as .... ronaldduckdanceXXXXman donaldmuckdanceXXXXtactics fonaldguckdanceXXXXbutcomps .... or say different lengths replacement like .... ronaldduckdanceXXXXXXXXman donaldmuckdanceXXXXXXXXtactics fonaldguckdanceXXXXXXXXbutcomps .... the bottomline being that there r 2 cases one being replacement being on base of position and the other being replaxcement on basis of certain pattern. HOW do i do this???? PLzzz help Regards Manish
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Manish Joneja |
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08-29-2001
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pattern replacement
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08-30-2001
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Hi,
Thanks a lot pals , one of the problems is solved but still one exists. i am unable to replace based on positions, could u shed some light on that part plzzzz. Regards Manish
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Manish Joneja |
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08-30-2001
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Hi optimus,
i turned the knob! looked in regular expresions too, but all i cud find is pattern replacement but noting on positional replacement! Help if u can plzzz. Regards Manish
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Manish Joneja |
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08-31-2001
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A few patterns to experiment with:
Some hints: Code:
. is any character
...... is any 6 characters
.\{6\} also any 6 characters
\(.\{6\}\) any 6 characters saved as subexpression
^\(.\{6\}\) first 6 characters saved as subexpression
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