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Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...bin/sh和/bin/bash是两个不同的文件，尽管它们的大小只相差100字节左右:
iMac:~ wuxiao$ ls -l /bin/*sh
-r-xr-xr-x 1 root wheel 1371648 6 Nov 16:52 /bin/bash
-rwxr-xr-x 2 root wheel 772992 6 Nov 16:52 /bin/csh
-r-xr-xr-x 1 root wheel 2180736 6 Nov 16:52 /bin/ksh
...
What is the preferred syntax for initializing a dict: curly brace literals {} or the dict() function
...ency.
It is faster:
$ python -m timeit "dict(a='value', another='value')"
1000000 loops, best of 3: 0.79 usec per loop
$ python -m timeit "{'a': 'value','another': 'value'}"
1000000 loops, best of 3: 0.305 usec per loop
If the special syntax for dictionary literals wasn't intended to be used, it p...
Tool to convert Python code to be PEP8 compliant
...ve --in-place --pep8-passes 2000 --verbose
Note: Sometimes the default of 100 passes isn't enough, I set it to 2000 as it's reasonably high and will catch all but the most troublesome files (it stops passing once it finds no resolvable pep8 infractions)...
At this point I suggest retesting and doin...
为什么你有10年经验，但成不了专家？ - 杂谈 - 清泛网 - 专注C/C++及内核技术
...自己完成任务水准的极限，用于刻意练习的时间可能会有1000小时。
所以，为什么有的人工作10年，仍然不是专家，而有的人2年时间，足够表现卓越？
表面上看是10年和2年的差距，实际上是10小时和1000小时的差距——因为真...
Algorithm to detect intersection of two rectangles?
...ed rectangles rectA(x=0, y=0, width=1, height=1) and rectB(x=2, y=0, width=100, height=1) don't intersect but your method says they intersect. Am I doing something wrong?
– Kagami Sascha Rosylight
Oct 11 '17 at 0:32
...
HTTP vs HTTPS performance
...ent won't get data until at least 4 legs (2 round trips). So, if it takes 100 ms for a packet to move between the client and the server, your first HTTPS request will take at least 500 ms.
Of course, this can be mitigated by re-using the HTTPS connection (which browsers should do), but it does e...
How are everyday machines programmed?
...
Also, EEPROM by definition can be rewritten 100000+ times. Write-once memories are obsolete; all popular microcontrollers today have Flash. FPGA is a completely different market from low-end MCU… you have no idea what you're talking about.
– Pot...
Automating “enter” keypresses for bash script generating ssh keys
...d to use ed25519 for security and performance.
yes "y" | ssh-keygen -o -a 100 -t ed25519 -C "Bla Bla" -f /mypath/bla -N ""
here
-o OpenSSH key format instead of older PEM (needs OpenSSH 6.5+)
-a Number of primality test while screening DH-GEX candidates
-t Type of key (ed25519, RSA, DSA etc.)
...
Calling Python in Java?
...pplication) As well as the python27.lib or whatever and the boost_python-vc100-mt-1_55.lib.
Then include Python/include, jdk/include, boost and only use shared libraries (dlls) otherwise boost has a teary. And yeah full on I know. There are so many ways in which this can go sour. So make sure you ge...
How can I use optional parameters in a T-SQL stored procedure?
...ame varchar(64) = null,
@Title varchar(64) = null,
@TopCount INT = 100
AS
BEGIN
DECLARE @SQL NVARCHAR(4000) = '
SELECT TOP ' + CAST(@TopCount AS VARCHAR) + ' *
FROM Person
WHERE 1 = 1'
PRINT @SQL
IF (@FirstName IS NOT NULL) SET @SQL = @SQL + ' AND FirstN...