File handling

editi has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: File handling by friedo (Prior) on May 30, 2007 at 11:00 UTC
`perl -pi.bak -e 's/manulation/modification/' file.txt` The `-i.bak` option will make a backup copy called file.txt.bak in case your regex goes disastrously wrong.	[reply] [d/l] [select]
Re^2: File handling by blazar (Canon) on May 30, 2007 at 19:34 UTC
`perl -pi.bak -e 's/manulation/modification/' file.txt` Actually that will change the first (and supposedly unique) occurrence of `'manulation'` in every line: indeed this makes sense, because the OP's request is sloppy to begin with. Anyway, he stresses that the substitution he wants must take place in a "particalur line" and mentions Tie::File, although to the effect of not wanting to use it. Thus I suspect he really wants the substitution to happen on a given line. But then... editi: given by what? If by a line number, say the tenth, then it's easy; you just have to enhance the above to: `perl -pi.bak -e '$.==10 and s/manulation/modification/' file.txt` [download] If it's something different, then you have to tell us.	[reply] [d/l] [select]
Re^3: File handling by Anonymous Monk on May 31, 2007 at 03:34 UTC
monks I have to use this in file manipulation like, `open(FILE,"....") or die $!; while(<FILE>) { //Here Change part has to come } close FILE` [download] 1)how to open a file like >+ or +<?. 2)how to modify with in this file in while loop Thanks in advance	[reply] [d/l]
Re^4: File handling by blazar (Canon) on May 31, 2007 at 07:48 UTC
Re: File handling by chrism01 (Friar) on May 31, 2007 at 07:14 UTC
One way is to 'slurp' the file into an array (1 rec per element), then amend array, then re-write file. There's a good example here (http://www.goldb.org/goldblog/CommentView.aspx?guid=a858e606-de5d-4378-b538-8d4738cd9438) if I'm allowed to point to it ... Cheers Chris	[reply]