大约有 3,300 项符合查询结果（耗时：0.0278秒） [XML]
How to do a logical OR operation in shell scripting
...d work:
#!/bin/bash
if [ "$#" -eq 0 ] || [ "$#" -gt 1 ] ; then
echo "hello"
fi
I'm not sure if this is different in other shells but if you wish to use <, >, you need to put them inside double parenthesis like so:
if (("$#" > 1))
...
...
C++STL容器使用经验总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...关联容器。
标准关联容器通常被实现为平衡的二叉查找树。也就是说，它所适合的那些应用程序首先做一些插入操作，然后做查找，然后可能又插入一些元素，或许接着删掉一些，随后又做查找，等等。这一系列时间的主要特...
Regex for numbers only
....21
76876876
.32
-894
-923.21
-76876876
-.32
some strings that doesn't:
hello
9bye
hello9bye
888,323
5,434.3
-8,336.09
87078.
share
|
improve this answer
|
follow
...
How to use double or single brackets, parentheses, curly braces
...d
$ var="abcde"; echo ${var/de/12}
abc12
Use a default value
$ default="hello"; unset var; echo ${var:-$default}
hello
and several more
Also, brace expansions create lists of strings which are typically iterated over in loops:
$ echo f{oo,ee,a}d
food feed fad
$ mv error.log{,.OLD}
(error.log...
How do I make $.serialize() take into account those disabled :input elements?
...
Use readonly inputs instead of disabled inputs:
<input name='hello_world' type='text' value='hello world' readonly />
This should get picked up by serialize().
share
|
improve thi...
What does the question mark and the colon (?: ternary operator) mean in objective-c?
...than once. For example: [myArray firstObject] ? [myArray firstObject] : @"Hello World"; calls firstObject twice (if firstObject does not return nil), where [myArray firstObject] ?: @"Hello World"; produces the identical result but never calls firstObject more than once.
– nhgr...
Convert a String In C++ To Upper Case
...boost/algorithm/string.hpp>
#include <string>
std::string str = "Hello World";
boost::to_upper(str);
std::string newstr = boost::to_upper_copy<std::string>("Hello World");
share
|
...
不同品牌的防火墙组成高可靠性集群 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...rying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
Hello, this is zebra (version 0.95a).
Copyright 1996-2004 Kunihiro Ishiguro.
User Access Verification
Password:
as1_route> en
Password:
as1_route# show run
Current configuration:
!
hostname as1_route
pas...
What's the difference between Perl's backticks, system, and exec?
...xec command";
my $data2 = exec('ls');
print "Now END exec command";
print "Hello $data2\n\n";
In above code, there are three print statements, but due to exec leaving the script, only the first print statement is executed. Also, the exec command output is not being assigned to any variable.
Here,...
Trim spaces from end of a NSString
...paces from the end of a string. How can I do that?
Example: if string is "Hello " it must become "Hello"
14 Answers
...