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Full Discussion: Grep multiple keywords from a file
Top Forums Shell Programming and Scripting Grep multiple keywords from a file Post 302997403 by Don Cragun on Friday 12th of May 2017 03:18:51 PM
Old 05-12-2017
In addition to what wbport suggested, there are some other alternatives in cases where the strings you are looking for all occur on a single line in your log files...

If the strings you are searching for always appear in the same order on a line (i.e., A1 followed by A2 followed by A3), you can use:
Code:
grep 'A1.*A2.*A3' file

If they can appear in any order, try one of the following:
Code:
egrep 'A1.*A2.*A3|A1.*A3.*A2|A2.*A1.*A3|A2.*A3.*A1|A3.*A1.*A2|A3.*A2.*A1' file
grep -e 'A1.*A2.*A3' -e 'A1.*A3.*A2' -e 'A2.*A1.*A3' -e 'A2.*A3.*A1' -e 'A3.*A1.*A2' -e 'A3.*A2.*A1' file

or create a file containing your REs (named REfile in this example) containing:
Code:
A1.*A2.*A3
A1.*A3.*A2
A2.*A1.*A3
A2.*A3.*A1
A3.*A1.*A2
A3.*A2.*A1

and then use:
Code:
grep -f REfile file

Note that if the strings you're searching for do not all appear on a single line, the code suggested by wbport will only print lines containing A3 (not lines containing just A1 or A2). If you want to print all lines containing A1, A2, or A3 but only print those lines if the file contains all three strings, you need an extra level of grep to print the final results (i.e. read some of your files four times when looking for 3 strings; three times to find the names of files that contain each string and a final time to print all three strings (using OR instead of AND). Or, you can use awk to read the file once, gather lines that match any of your strings and keep track of which strings have been found, and then print all matching lines at the end if all of your strings have been found. If this is what you need, we can help you figure out a way to do that, but I'm not going to try to do it here if you don't need to do that. Your description of your problem isn't clear as to the extent of the problem you're trying to solve.
 

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LEARN ABOUT DEBIAN

bup-margin

bup-margin(1)						      General Commands Manual						     bup-margin(1)

NAME

       bup-margin - figure out your deduplication safety margin

SYNOPSIS

       bup margin [options...]

DESCRIPTION

       bup margin  iterates  through  all  objects  in	your  bup repository, calculating the largest number of prefix bits shared between any two
       entries.  This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.

       For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45.  That  means  a  46-bit
       hash  would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
       its first 46 bits.

       The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects.  Since SHA-1 hashes have 160 bits,
       that  leaves 115 bits of margin.  Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
       with far fewer objects.

       If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see	if
       you're getting dangerously close to 160 bits.

OPTIONS

       --predict
	      Guess  the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
	      from the guess.  This is potentially useful for tuning an interpolation search algorithm.

       --ignore-midx
	      don't use .midx files, use only .idx files.  This is only really useful when used with --predict.

EXAMPLE

	      $ bup margin
	      Reading indexes: 100.00% (1612581/1612581), done.
	      40
	      40 matching prefix bits
	      1.94 bits per doubling
	      120 bits (61.86 doublings) remaining
	      4.19338e+18 times larger is possible

	      Everyone on earth could have 625878182 data sets
	      like yours, all in one repository, and we would
	      expect 1 object collision.

	      $ bup margin --predict
	      PackIdxList: using 1 index.
	      Reading indexes: 100.00% (1612581/1612581), done.
	      915 of 1612581 (0.057%)

SEE ALSO

       bup-midx(1), bup-save(1)

BUP

       Part of the bup(1) suite.

AUTHORS

       Avery Pennarun <apenwarr@gmail.com>.

Bup unknown-															     bup-margin(1)
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