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Top Forums Shell Programming and Scripting bash keep only duplicate lines in file Post 302653577 by vlm on Saturday 9th of June 2012 02:02:53 PM
Old 06-09-2012
Quote:
Originally Posted by agama
To do this a bit more information is needed:

1) is the file sorted, or are the lines you wish to 'keep' adjacent to each other in the file?

2) is the order of the output important? Do the lines 'kept' need to be in the same order that they appeared in the input?

3) do some lines appear more than twice, and should those be kept as well, or do you want to keep the lines that appear exactly twice?

4) how big is the file in terms of number of lines?
1)yes the files are sorted

2)no the output order is not at all important

3)lines appear either once or twice

4)that's not known..some files have 500 lines or more and some 4...

I found this:

Code:
comm -3 file1 file2 > file3

but it stores to file3 the lines that appear only in the one file and not in the other,the exact opposite from what I wantSmilie

Actually

Code:
comm -12 file1 file2 > file3

is what I want but it makes the execution much slower

Last edited by vlm; 06-09-2012 at 03:12 PM..
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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