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How do I make a Git commit in the past?
I'm converting everything over to Git for my own personal use and I found some old versions of a file already in the repository. How do I commit it to the history in the correct order according the file's "date modified" so I have an accurate history of the file?
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Quickly create a large file on a Linux system
...her answers is a good solution, but it is slow for this purpose. In Linux (and other POSIX systems), we have fallocate, which uses the desired space without having to actually writing to it, works with most modern disk based file systems, very fast:
For example:
fallocate -l 10G gentoo_root.img
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How to create a CPU spike with a bash command
...want to create a near 100% load on a Linux machine. It's quad core system and I want all cores going full speed. Ideally, the CPU load would last a designated amount of time and then stop. I'm hoping there's some trick in bash. I'm thinking some sort of infinite loop.
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Print number of keys in Redis
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You can issue the INFO command, which returns information and statistics about the server. See here for an example output.
As mentioned in the comments by mVChr, you can use info keyspace directly on the redis-cli.
redis> INFO
# Server
redis_version...
“NODE_ENV” is not recognized as an internal or external command, operable command or batch file
...s would be
SET NODE_ENV=development
node foo.js
running in the same command shell. You mentioned set NODE_ENV did not work, but wasn't clear how/when you executed it.
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Match two strings in one line with grep
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@AlexanderN indeed I cant make it work with multiline, thats so weird it was accepted..
– Aquarius Power
Oct 24 '13 at 3:23
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Getting error: Peer authentication failed for user “postgres”, when trying to get pgsql working with
...rks by obtaining the client's
operating system user name from the kernel and using it as the allowed
database user name (with optional user name mapping). This method is
only supported on local connections.
Password authentication
The password-based authentication methods are md5 and pas...
How do malloc() and free() work?
I want to know how malloc and free work.
13 Answers
13
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How do you use String.substringWithRange? (or, how do Ranges work in Swift?)
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You can use the substringWithRange method. It takes a start and end String.Index.
var str = "Hello, playground"
str.substringWithRange(Range<String.Index>(start: str.startIndex, end: str.endIndex)) //"Hello, playground"
To change the start and end index, use advancedBy(n).
v...
How can I get Docker Linux container information from within the container itself?
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Aaaaand Docker 1.12: cat /proc/1/cgroup | grep 'docker/' | tail -1 | sed 's/^.*\///' | cut -c 1-12
– smets.kevin
Jul 27 '16 at 21:05
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