Designed for programmers with large heterogeneous trees of source code, ack is written in portable Perl 5 and takes advantage of the power of Perl's regular expressions. The error message ack displays when the regex passed is invalid has been improved.

The message is more readable and includes a pointer to the offending part of the regex. For example:. This is useful when looking for matches that are related to each other. The -w option, which tells ack to only find whole-word matches, did not always work if your pattern began or ended with puncutation. Now, ack disallows regexes that begin or end with non-word characters. This means that if you use ack -w foo:the new ack will not allow it, whereas ack 2.

For those without --smart-case always on, the -S will be easier for when you do want to use it. Smart-case matching makes ack do a case-insensitive search unless the pattern being matched has a capital letter in it. If you use --smart-case in your. Run times for ack 3 compared to ack 2. Read how. Such a thing is Ack, the grep replacement. We're all about knowing when to move beyond the stock Unix tools.

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Follow us on Twitter at beyondgrep for tips, hints and software news. Ack is copyright Andy Lesterandy petdance. Thanks to DigitalOcean for their support. Why ack? The latest version of ack is v3. What's new in ack 3? Easier to understand error messages The error message ack displays when the regex passed is invalid has been improved.

Added -S as a synonym for --smart-case For those without --smart-case always on, the -S will be easier for when you do want to use it.

ack is a grep-like source code search tool.

Added -I to force case-sensitivity If you use --smart-case in your. Significant speed improvements Run times for ack 3 compared to ack 2. How to install ack is simple to install, via CPAN, package or simple download. People love ack "Every once in a while something comes along that improves an idea so much, you can't ignore it. Follow us on Twitter We're all about knowing when to move beyond the stock Unix tools.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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fast grep

Any recommendations on grep tools for Windows? Ideally ones that could leverage bit OS. Now I realize that the other grep tools can do all of the above. From the same wonderful folks who brought you RegexBuddy and who I have no affiliation with beyond loving their stuff.

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I've been using grepWin which was written by one of the tortoisesvn guys. Does the job on Windows Another grep tool I now use all the time on Windows is AstroGrep :. Its ability to show me more than just the line search i. And it is fast. Very fast, even on an old computer with non- SSD drive I know, they used to do this hard drive with spinning disks, called platterscrazy right? Gnu Grep is alright. You can download it for example here: site ftp. All the usual options are here.

That, combined with gawk and xargs includes 'find', from GnuWin32and you can really script like you were on Unix! See also the options I am using to grep recursively :. PowerShell's Select-String cmdlet was fine in v1. Having PowerShell built in to recent versions of Windows means your skills here will always useful, without first installing something. New parameters added to Select-String : Select-String cmdlet now supports new parameters, such as:.

I find it expedient to create an function gcir for Get-ChildItem -Recurse. So you an write:. It may not exactly fall into the 'grep' category, but I couldn't get by on Windows without a utility called AgentRansack. It's a gui-based "find in files" utility with regex support. It's dead simple to right-click on a folder, hit "ransack. Extremely fast too. Baregrep Baretail is good too. PowerShell has been mentioned a few times. Here is how you would actually use it in a grepish way:.Most of the existing tools for searching through large amounts of text are either fast but inflexible the original grep or slightly more flexible but slow or complicated to install.

The additional features include gitignore support, conditions e. If you want sift to ignore case, show line numbers, skip binary files and understand. Please see the features and samples to get a better impression of what you can do with sift. The goals and design principles of sift are documented here to give a better idea of what to expect from sift.

Search everywhere, unless specified otherwise: let the user decide what should not be searched. Make it easy to customize sift through config files to change the default behavior system-wide or for a specific project path.

Select performance-oriented alternatives by default. Strive for stability and correctness, especially when used as grep replacement. Optimize for future performance requirements, i. Be unobtrusive: only write to files if requested by the user, never execute other programs on the system.

Toggle navigation.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

fast grep

Any recommendations on grep tools for Windows? Ideally ones that could leverage bit OS. Now I realize that the other grep tools can do all of the above. From the same wonderful folks who brought you RegexBuddy and who I have no affiliation with beyond loving their stuff.

I've been using grepWin which was written by one of the tortoisesvn guys. Does the job on Windows Another grep tool I now use all the time on Windows is AstroGrep :. Its ability to show me more than just the line search i. And it is fast. Very fast, even on an old computer with non- SSD drive I know, they used to do this hard drive with spinning disks, called platterscrazy right?

Gnu Grep is alright. You can download it for example here: site ftp. All the usual options are here.

FastGREP - Fast search and replace

That, combined with gawk and xargs includes 'find', from GnuWin32and you can really script like you were on Unix! See also the options I am using to grep recursively :. PowerShell's Select-String cmdlet was fine in v1.

Having PowerShell built in to recent versions of Windows means your skills here will always useful, without first installing something.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I am really amazed by the functionality of GREP in shell, earlier I used to use substring method in java but now I use GREP for it and it executes in a matter of seconds, it is blazingly faster than java code that I used to write.

That being said I have not been able to figure out how it is happening? Assuming your question regards GNU grep specifically. Here's a note from the author, Mike Haertel:. GNU grep uses the well-known Boyer-Moore algorithm, which looks first for the final letter of the target string, and uses a lookup table to tell it how far ahead it can skip in the input whenever it finds a non-matching character.

fast grep

GNU grep also unrolls the inner loop of Boyer-Moore, and sets up the Boyer-Moore delta table entries in such a way that it doesn't need to do the loop exit test at every unrolled step. The result of this is that, in the limit, GNU grep averages fewer than 3 x86 instructions executed for each input byte it actually looks at and it skips many bytes entirely. GNU grep uses raw Unix input system calls and avoids copying data after reading it.

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Looking for newlines would slow grep down by a factor of several times, because to find the newlines it would have to look at every byte!

So instead of using line-oriented input, GNU grep reads raw data into a large buffer, searches the buffer using Boyer-Moore, and only when it finds a match does it go and look for the bounding newlines Certain command line options like -n disable this optimization. This answer is a subset of the information taken from here.

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It may not be widely known but grep is almost always faster when grepping for a longer pattern-string than a short one, because in a longer pattern, Boyer-Moore can skip forward in longer strides to achieve even better sublinear speeds:.

How come? Boyer-Moore consructs a skip-forward table from the pattern-string, and whenever there's a mismatch, it picks the longest skip possible from last char to first before comparing a single char in the input to the char in the skip table.

Here's a video explaining Boyer Moore Credit to kommradHomer. Another common misconception for GNU grep is that fgrep is faster than grep.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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EasyGrep is a plugin for performing search and replace operations through multiple files. Vim already has builtin support for searching through files with its 'vimgrep' and 'grep' commands, but EasyGrep makes using them much, much easier. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit d0c36a7 Feb 9, Why EasyGrep? Supports multiple Grep programs vimgrep, grep, ack, ag, pt, git grep, csearch. Mapping-based or command-based searches. Allows searching all files, just buffers, or a user-specified pattern. Allows excluding unwanted files. Searches from a configurable location, like a project root. And much more When an! The function searches the same set of files a grep for the desired target and opens a dialog to confirm replacement.

Does not stack successive searches; only the last replace may be undone. This function may not work well when edits are made between a call to Replace and a call to ReplaceUndo.

An optional argument may be provided to switch to the program without user interaction. Roots: 1. The current directory.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Super User is a question and answer site for computer enthusiasts and power users. It only takes a minute to sign up. I am looking for a tool that will be faster than grep, maybe a multi-threaded grep, or something similar I have been looking at a bunch of indexers, but I am not sold that I need an index I have about million text files, that I need to grep for exact string matches, upon finding a string match, I need the filename where the match was found.

Its about 4TB of data, and I started my first search 6 days ago, and grep is still running. I've reviewed the following, however, I don't think I need all the bells and whistles these indexers come with, I just need the filename where the match occurred EDIT: Searching for multi-threaded grep returns several items, My question is, is a multi-threaded grep the best option for what I am doing?

EDIT2: After some tweaking, this is what I have come up with, and it is going much faster than the regular grep, I still wish it was faster though If you just need matching filenames, and not the actual matches found in the files, then you should run grep with the -l flag. This flag causes grep to just print filenames that match, and not print the matching lines. The value here is that it permits grep to stop searching a file once it has found a match, so it could reduce the amount of work that grep has to do.

If you're searching for fixed strings rather than regular expressions, then you could try using fgrep rather than grep. Fgrep is a variant of grep that searches for fixed strings, and searching for fixed strings is faster than running a regular expression search. You may or may not see any improvement from this, because modern versions of grep are probably smart enough to optimize fixed-string searches anyway.

fast grep

If you want to try running multiple searches in parallel, you could do it using shell utilities. One way would be to build a list of filenames, split it into parts, and run grep separately for each list:. This uses find to find the files, splits the list of filenames into groups of ten million, and runs grep in parallel for each group. The output of the greps are all joined together at the end. This ought to work for files with typical names, but it'd fail for files that had newlines in their names for example.

Another approach uses xargs. First, you'd have to write a simple shell script that runs grep in the background:. This will run grep on the list of files specified as arguments to the script, writing the result to a file named after the process's PID.