how to search for a string in large file?

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

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Re: how to search for a string in large file? by NetWallah (Canon) on Mar 18, 2014 at 17:28 UTC
`Linux: grep -c "string" Very-large.file Win: find /C "string" File-name.txt Perl: perl -ne "$x++ if m/string/}{print qq\|$x\n\|" Large-file.txt (Change to single quote for Linux)` [download] What is the sound of Perl? Is it not the sound of a wall that people have stopped banging their heads against? -Larry Wall, 1992	[reply] [d/l]
Re: how to search for a string in large file? by thezip (Vicar) on Mar 18, 2014 at 16:59 UTC
`grep <string> <filename> \| wc -l` My tenacity goes to eleven...	[reply] [d/l]
Re: how to search for a string in large file? by oiskuu (Hermit) on Mar 18, 2014 at 18:22 UTC
`perl -ne '$n += () = /foo/g }{ print $n' <(< large.txt fgrep foo)` [download] Though this might not cover them all. Should "foof" match "foofoof" once or twice?	[reply] [d/l]
Re^2: how to search for a string in large file? by littlemonk (Sexton) on Mar 18, 2014 at 18:55 UTC
could please explain me the answer .. im new to perl!! :(	[reply]