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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...t.
#!/bin/bash
(
# Wait for lock on /var/lock/.myscript.exclusivelock (fd 200) for 10 seconds
flock -x -w 10 200 || exit 1
# Do stuff
) 200>/var/lock/.myscript.exclusivelock
This ensures that code between ( and ) is run only by one process at a time and that the process doesn’t wait...
How do I initialize a byte array in Java?
...string to byte[], you could do
byte[] CDRIVES = hexStringToByteArray("e04fd020ea3a6910a2d808002b30309d");
I'd suggest you use the function defined by Dave L in Convert a string representation of a hex dump to a byte array using Java?
I insert it here for maximum readability :
public static byt...
Send string to stdin
...din. The <(…) is bash process substitution. Roughly it creates a /dev/fd/… file with the output of the substituting command and passes that filename in place of the <(…), resulting here for example in script < /dev/fd/123. For details, see this answer.
Comparison with other solutions
...
How to get an MD5 checksum in PowerShell
...leage may vary:
$md5 = [System.Security.Cryptography.MD5]::Create("MD5")
$fd = [System.IO.File]::OpenRead($file)
$buf = New-Object byte[] (1024*1024*8) # 8 MB buffer
while (($read_len = $fd.Read($buf,0,$buf.length)) -eq $buf.length){
$total += $buf.length
$md5.TransformBlock($buf,$offset,$b...
实战Nginx与PHP（FastCGI）的安装、配置与优化 - 更多技术 - 清泛网 - 专注...
...PM也是一个第三方的FastCGI进程管理器，它是作为PHP的一个补丁来开发的，在安装的时候也需要和PHP源码一起编译，也就是说PHP-FPM被编译到PHP内核中，因此在处理性能方面更加优秀；同时它在处理高并发方面也比spawn-fcgi引擎好很...
Linux的诞生和发展 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...还很遥远。同时，从0.95 版开始，对内核的许多改进之处(补丁程序的提供)均以其他人为主了，而Linus 的主要任务开始变成对内核的维护和决定是否采用某个补丁程序。
Linux 名称的来由
Linux 操作系统刚开始时并没有...
Disable output buffering
...(line_buffering=True)
except TypeError:
# Python 2
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
Credits: "Sebastian", somewhere on the Python mailing list.
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Why is there “data” and “newtype” in Haskell? [duplicate]
... constructor
with exactly one field inside it.
Some Examples:
newtype Fd = Fd CInt
-- data Fd = Fd CInt would also be valid
-- newtypes can have deriving clauses just like normal types
newtype Identity a = Identity a
deriving (Eq, Ord, Read, Show)
-- record syntax is still allowed, but only...
git: undo all working dir changes including new files
...en you are ready to actually delete, then remove the -n flag:
git clean -nfd
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How to change the docker image installation directory?
... 17.06-ce paste:
[Service]
ExecStart=
ExecStart=/usr/bin/docker daemon -H fd:// --graph="/mnt"
For docker after 17.06-ce paste:
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H fd:// --data-root="/mnt"
Alternative method through daemon.json
I recently tried above procedure with 17.09-ce on ...