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Linux bpftrace学习笔记（持续更新） - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
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Tracing open syscalls... Hit Ctrl-C to end.
PID COMM FD ERR PATH
4235 head -1 2 tls/x86_64/x86_64/libc.so.6
4235 head -1 2 tls/x86_64/libc.so.6
4235 head -1 2 tls/x86_64/libc.so.6
4235 head -1 2 tls/lib...
Removing input background colour for Chrome autocomplete?
...the colour of the autofill by doing:
input:-webkit-autofill {
color: #2a2a2a !important;
}
Note, there is a bug being tracked for this to work again: http://code.google.com/p/chromium/issues/detail?id=46543
This is a WebKit behavior.
...
How do I dump an object's fields to the console?
...
The to_yaml method seems to be useful sometimes:
$foo = {:name => "Clem", :age => 43}
puts $foo.to_yaml
returns
---
:age: 43
:name: Clem
(Does this depend on some YAML module being loaded? Or would that typically be available?)
...
How do you convert a byte array to a hexadecimal string, and vice versa?
..."1F",
"20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2A", "2B", "2C", "2D", "2E", "2F",
"30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3A", "3B", "3C", "3D", "3E", "3F",
"40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4A", "4B", "4C", ...
Override browser form-filling and input highlighting with HTML/CSS
...ll make the text readable again.
input:-webkit-autofill {
color: #2a2a2a !important;
}
4) a css/javascript solution:
css:
input:focus {
background-position: 0 0;
}
and the following javascript has to be run onload:
function loadPage()
{
if (document.login)//if the form l...
How to return dictionary keys as a list in Python?
...le for quite some time, even in Python 2. In function calls you can do def foo(*args): print(args) followed by foo(*{1:0, 2:0}) with the result (1, 2) being printed. This behavior is specified in the Calls section of the reference manual. Python 3.5 with PEP 448 just loosened the restrictions on whe...
Understanding colors on Android (six characters)
...tln(String.format("%d%% — %s", percent, hex));
}
Output:
100% — FF
99% — FC
98% — FA
97% — F7
96% — F5
95% — F2
94% — F0
93% — ED
92% — EB
91% — E8
90% — E6
89% — E3
88% — E0
87% — DE
86% — DB
85% — D9
84% — D6
83% — D4
82% — D1
81% — CF
80% — CC
79% ...
How do I use extern to share variables between source files?
...y literals to get an enumeration value for the array size, exemplified by (foo.h): #define FOO_INITIALIZER { 1, 2, 3, 4, 5 } to define the initializer for the array, enum { FOO_SIZE = sizeof((int [])FOO_INITIALIZER) / sizeof(((int [])FOO_INITIALIZER)[0]) }; to get the size of the array, and extern i...
How can I check if a program exists from a Bash script?
...ms have a which that doesn't even set an exit status, meaning the if which foo won't even work there and will always report that foo exists, even if it doesn't (note that some POSIX shells appear to do this for hash too).
Many operating systems make which do custom and evil stuff like change the out...
Node.js check if file exists
...ter a minute search try this :
var path = require('path');
path.exists('foo.txt', function(exists) {
if (exists) {
// do something
}
});
// or
if (path.existsSync('foo.txt')) {
// do something
}
For Node.js v0.12.x and higher
Both path.exists and fs.exists have been de...