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Fast way of finding lines in one file that are not in another?

I have two large files (sets of filenames). Roughly 30.000 lines in each file. I am trying to find a fast way of finding lines in file1 that are not present in file2. ...
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How to merge specific files from Git branches

I have 2 git branches branch1 and branch2 and I want to merge file.py in branch2 into file.py in branch1 and only that file. ...
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Writing outputs to log file and console

In Unix shell, I have a env file ( env file defines the parameters required for running the user script like log file name and path, redirect outputs and errors to log file, database connection details, etc ) which redirects all the outputs ( echo messages ) and errors to the log file from the execu...
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How to force file download with PHP

I want to require a file to be downloaded upon the user visiting a web page with PHP. I think it has something to do with file_get_contents , but am not sure how to execute it. ...
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Save and load MemoryStream to/from a file

...to write content of memory stream to another stream. memoryStream.WriteTo(fileStream); Update: fileStream.CopyTo(memoryStream); memoryStream.CopyTo(fileStream); share | improve this answer ...
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Fastest way to tell if two files have the same contents in Unix/Linux?

I have a shell script in which I need to check whether two files contain the same data or not. I do this a for a lot of files, and in my script the diff command seems to be the performance bottleneck. ...
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GNU Makefile rule generating a few targets from a single source file

...owing. There is a program, call it foo-bin , that takes in a single input file and generates two output files. A dumb Makefile rule for this would be: ...
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Cast Int to enum in Java

... Try MyEnum.values()[x] where x must be 0 or 1, i.e. a valid ordinal for that enum. Note that in Java enums actually are classes (and enum values thus are objects) and thus you can't cast an int or even Integer to an enum. ...
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Pandas dataframe get first row of each group

... >>> df.groupby('id').first() value id 1 first 2 first 3 first 4 second 5 first 6 first 7 fourth If you need id as column: >>> df.groupby('id').first().reset_index() id value 0 1 first 1 ...
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Cannot create or edit Android Virtual Devices (AVD) from Eclipse, ADT 22.6

...t a new question on Stackoverflow with snaphots of the error and error log file located in eclipse directory and more details of what happened? – Mohamed El-Nakib Apr 13 '14 at 20:57 ...