By John Bambenek
This little ebook is every little thing a pocket reference will be. grep and egrep should not challenging to exploit, yet there are various legitimate mixtures of techniques, and this ebook pretty well covers all of them. which will locate expressions in a single or extra records, this is often the device to exploit. it is simple to put out of your mind every little thing on hand, so this e-book places every thing in a single position for you. there is even a piece on an choice of grep that's merely legitimate with PERL, so that you may possibly or would possibly not have entry to it. the subsequent is the desk of contents because it isn't really indexed within the product description. One note of caution - for those who do not already comprehend general expressions this booklet will not train it to you. it really is certainly only a fast reference for ideas you'll want to already be aware of. The complex information and methods part is the one exception to that rule and is itself well worth the fee of admission.
Chapter 1. grep Pocket Reference
Section 1.1. advent
Section 1.2. Conceptual assessment
Section 1.3. advent to usual Expressions
Section 1.4. grep fundamentals
Section 1.5. easy general Expressions (grep or grep -G)
Section 1.6. prolonged standard Expressions (egrep or grep -E)
Section 1.7. fastened Strings (fgrep or grep -F)
Section 1.8. Perl-Style commonplace Expressions (grep -P)
Section 1.9. advent to grep-Relevant atmosphere Variables
Section 1.10. determining among grep forms and function concerns
Section 1.11. complicated counsel and tips with grep
Section 1.12. References
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Additional resources for Grep Pocket Reference (Pocket Reference (O'Reilly))
There is far more to it than can be discussed here, but the chief advantage with PCRE is its flexibility and power, which goes well beyond what regular expressions can do. The downside is the great deal of complexity and ambiguity that can be involved. Introduction to grep-Relevant Environment Variables In previous examples, we came across the concept of environment variables and their effect on grep. Environment variables allow you to customize the default options and behavior of grep by defining the environment settings of the shell, thereby making your life easier.
Backreferences The grep program has the ability to match based on multiple previous conditions. For instance, if you want to find all lines that repeatedly use a particular set of words, a single grep pattern will not work; however, it is possible to do this with the use of backreferences. Suppose you wish to find any line that has multiple instances of the words “red”, “blue”, or “green”. Imagine the following text file: The red dog fetches the green ball. The green dog fetches the blue ball. The blue dog fetches the blue ball.
This is done by surrounding the matched (nonempty) string, matching lines, context lines, filenames, line numbers, byte offsets, and separators with escape sequences that the terminal recognizes as color markers. Color is defined by the environment variable GREP_COLORS (discussed later). WHEN has three options: never, always, and auto. log Instead of normal output, prints just the names of input files containing the pattern. As with -L, the search stops on the first match. If an administrator is simply interested in the filenames that contain a pattern without seeing all the matching lines, this option performs that function.
Grep Pocket Reference (Pocket Reference (O'Reilly)) by John Bambenek