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Java Replacing multiple different substring in a string at once (or in the most efficient way)
...String,String> tokens = new HashMap<String,String>();
tokens.put("cat", "Garfield");
tokens.put("beverage", "coffee");
String template = "%cat% really needs some %beverage%.";
// Create pattern of the format "%(cat|beverage)%"
String patternString = "%(" + StringUtils.join(tokens.keySet()...
How to create a MySQL hierarchical recursive query
...nitialisation
where find_in_set(parent_id, @pv)
and length(@pv := concat(@pv, ',', id))
Here is a fiddle.
Here, the value specified in @pv := '19' should be set to the id of the parent you want to select all the descendants of.
This will work also if a parent has multiple children. However...
How to use R's ellipsis feature when writing your own function?
...parameter in advance, however, as it adds some ambiguity and further complication to the argument string (and makes the function signature unclear to any other user). The argument list is an important piece of documentation for function users.
Otherwise, it is also useful for cases when you want t...
How to find out which processes are using swap space in Linux?
...kB\tpid";
echo "========================================";
cat ${TMP}/${SCRIPT_NAME}.name|sort -r;
;;
kb )
echo -e "kB\tpid\tname";
echo "========================================";
cat ${TMP}/${SCRIPT_NAME}.kb|sort -rh;
;;
pid | * )
...
Why is (object)0 == (object)0 different from ((object)0).Equals((object)0)?
...
The C# Language Specification, paragraph 7.10.6, says: The predefined reference type equality operators are: bool operator ==(object x, object y); bool operator !=(object x, object y); The operators return the result of comparing the two references...
通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...序都不会受其影响：
Shell 进程 1
ulimit – s 100
cat testFile > newFile
File size limit exceeded
Shell 进程 2
cat testFile > newFile
ls – s newFile
323669 newFile
那么，是否有针对某个具体用户的资源加以限制的方法呢？答...
C++11 tuple 这一篇就够了 - C/C++ - 清泛网 - 专注C/C++及内核技术
...,从而不用关联tuple中的第二个元素.
最后介绍一个tuple_cat()函数，通过该函数可以将多个tuple连接起来形成一个tuple（注：在VC11中只能连接两个tuple并不是真正的多个tuple）。
#include <iostream>
#include <utility>
#include <string>
#inclu...
一次「Too many open files」故障 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...最大文件数到底是多少呢？可以通过 proc 确认：
shell> cat /proc/<PID>/limits
结果是「4096」，我们还可以进一步看看 ElasticSearch 打开的都是什么东西：
shell> ls /proc/<PID>/fd
问题看上去非常简单，只要加大相应的配置项应该就可以...
Subversion钩子 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的工具php-svn-hook，不过我们这里选择自己实现：
shell> cat /path/to/repository/hooks/pre-commit
#!/bin/bash
REPOS="$1"
TXN="$2"
SVNLOOK="/usr/bin/svnlook"
PHP="/usr/bin/php"
LOG=$($SVNLOOK log -t "$TXN" "$REPOS")
if [ "$LOG" = "" ]; then
echo "Please input lo...
[解决]CTRL: PTY read or GRE write failed - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ptp vpn服务器连接失败出现以下日志内容:（查看系统日志[cat var log messages |grep pptpd]后发现）GRE: read(fd=6,buffer=80504c0...pptp vpn服务器连接失败出现以下日志内容：
（查看系统日志[ cat /var/log/messages |grep pptpd ]后发现）
GRE: read(fd=6,...