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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...th on an Intel Core Duo, and while looking at various approaches to square root I've noticed something odd: using the SSE scalar operations, it is faster to take a reciprocal square root and multiply it to get the sqrt, than it is to use the native sqrt opcode!
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Is there a way to get the git root directory in one command?
Mercurial has a way of printing the root directory (that contains .hg) via
22 Answers
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detect key press in python?
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keyboard apparently requires root in linux :/
– Inaimathi
Nov 14 '17 at 16:05
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Insert a line at specific line number with sed or awk
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sed -e '8iProject_Name=sowstest' -i start using GNU sed
Sample run:
[root@node23 ~]# for ((i=1; i<=10; i++)); do echo "Line #$i"; done > a_file
[root@node23 ~]# cat a_file
Line #1
Line #2
Line #3
Line #4
Line #5
Line #6
Line #7
Line #8
Line #9
Line #10
[root@node23 ~]# sed -e '3ixxx inse...
NodeJS require a global module/package
...ively instead of a static path, i.e. if you are using NVM: NODE_PATH=$(npm root -g)
– holmberd
May 30 '19 at 14:05
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How to specify in crontab by what user to run script? [closed]
I have few crontab jobs that run under root, but that gives me some problems. For example all folders created in process of that cron job are under user root and group root.
How can i make it to run under user www-data and group www-data so when i run scripts from my website i can manipulate those ...
Can someone explain in simple terms to me what a directed acyclic graph is?
... Andriyev, +1 for the deadlock example. This is in fact used by MySQL's InnoDB engine, and they call it a "wait-for-graph", as in, "that row has to wait for the lock on that row to be released"
– Roland Bouman
Feb 17 '10 at 19:40
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How do I use sudo to redirect output to a location I don't have permission to write to?
...is performed by your shell which does not have the permission to write to /root/test.out. The redirection of the output is not performed by sudo.
There are multiple solutions:
Run a shell with sudo and give the command to it by using the -c option:
sudo sh -c 'ls -hal /root/ > /root/test.out'...
Can you have additional .gitignore per directory within a single repo?
...untracked (Feb 2010)
Further perhaps related: How do I tell git to always select my local version for conflicted merges on a specific file?
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In Docker, what's the difference between a container and an image? [duplicate]
...o give us an interactive bash shell.
$ docker run -i -t ubuntu /bin/bash
root@48cff2e9be75:/# ls
bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
root@48cff2e9be75:/# cat > foo
This is a really important file!!!!
root@48cff2e9be75:/# exit
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