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Given two directory trees, how can I find out which files differ by content?
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You said Linux, so you luck out (at least it should be available, not sure when it was added):
diff --brief --recursive dir1/ dir2/ # GNU long options
diff -qr dir1/ dir2/ # common short options
Should do what you need.
If you als...
GCC dump preprocessor defines
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A portable approach that works equally well on Linux or Windows (where there is no /dev/null):
echo | gcc -dM -E -
For c++ you may use (replace c++11 with whatever version you use):
echo | gcc -x c++ -std=c++11 -dM -E -
It works by telling gcc to preprocess stdin (w...
Is there a way to change the environment variables of another process in Unix?
...02.htm for details.
Just a comment on the answer about using /proc. Under linux /proc is supported but, it does not work, you cannot change the /proc/${pid}/environ file, even if you are root: it is absolutely read-only.
sh...
How to force GitHub Pages build?
...script:
If you use Windows 10:
You need to setup Windows Subsystem for Linux, if not already done. Follow this to do so.
Remove the first line (#!/bin/bash) from the script and save the script as RebuildPage.bat. (i.e., replace .sh with .bat in the script file name)
Alternative to the above poin...
Fastest way to check if a file exist using standard C++/C++11/C?
...0.134s**
The stat() function provided the best performance on my system (Linux, compiled with g++), with a standard fopen call being your best bet if you for some reason refuse to use POSIX functions.
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What is the behavior of integer division?
...truncates towards 0 rather than flooring - I learnt this reading about why Python integer division always floors here: Why Python's Integer Division Floors
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Apache is downloading php files instead of displaying them
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Note that this only works under Linux (and specifically Debian Linux).
– Gwyneth Llewelyn
Mar 1 '17 at 17:13
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Why does SIGPIPE exist?
...the first place. This answer makes sense, though IMO it's odd that e.g. on Linux this laziness is achieved by kernel and not the libc.
– Shea Levy
Mar 19 '14 at 21:31
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Android studio using > 100% CPU at all times - no background processes appear to be running
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This worked great for me in Linux (Ubuntu) too. I just disabled all VCS background options and from hogging the CPU, now it's using less than 2% of it according to top. So many thanks!
– Fran Marzoa
Mar 2 '18 at 19...
How to remove multiple indexes from a list at the same time? [duplicate]
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Please excuse my comment, I'm learning Python, but Python reindex the array while looping for delete ? Why if you loop in normal order it raise an undefined offset exception ?
– kitensei
Jun 20 '14 at 21:19
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