Delete a line from files

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

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Re: Delete a line from files by AnomalousMonk (Archbishop) on Oct 12, 2015 at 01:44 UTC
Further to `AnonyMonk`'s advice above, also consult perlrun about the effects of the `-i`, `-n` and `-l` flags; they all act to add code around the code you supply on the command line. Update: E.g., `c:\@Work\Perl\monks>perl -MO=Deparse,-p -i -n -le "/apple/\|\|print " BEGIN { $^I = ""; } BEGIN { $/ = "\n"; $\ = "\n"; } LINE: while (defined(($_ = <ARGV>))) { chomp($_); (/apple/ or print($_)); } -e syntax OK` [download] See O and B::Deparse. Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]
Re^2: Delete a line from files by Anonymous Monk on Oct 12, 2015 at 11:03 UTC
what is the purpose of the BEGIN blocks?	[reply]
Re^3: Delete a line from files by karlgoethebier (Abbot) on Oct 12, 2015 at 11:38 UTC
"...the purpose of the BEGIN blocks?" Begin to read? Update: Slight losses are usual in every combat. Regards, Karl ŤThe Crux of the Biscuit is the Apostropheť	[reply]
Re^4: Delete a line from files by Anonymous Monk on Oct 12, 2015 at 21:48 UTC
Re^5: Delete a line from files by soonix (Chancellor) on Oct 13, 2015 at 08:56 UTC
Some notes below your chosen depth have not been shown here
Re: Delete a line from files by Anonymous Monk on Oct 11, 2015 at 23:38 UTC
read perlintro (and read it well, from the beginning), read when it talks about creating and initializing variables with my, opening files with open/binmode, reading the files in a while loop with readline, print strings to new file handle, and testing strings with m//atch operator in Simple matching/perlrequick Editing a file is fours steps read original-file modify data write new-file rename new-file to original-file And maybe read Path::Tiny if you like convenience methods	[reply]