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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...
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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 | * ) ...
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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...
https://www.tsingfun.com/it/os_kernel/712.html 

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...
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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...
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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...
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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...
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[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,...
https://www.tsingfun.com/it/os_kernel/2002.html 

Linux iptables防火墙开放mysql、apache的端口 - 操作系统(内核) - 清泛网 ...

...改配置,添加两条tcp端口允许的记录:[root@iZ23rlmiwviZ ~] cat etc sysconfig iptables sample configuration for iptables service vi /etc/sysconfig/iptables 修改配置,添加两条tcp端口允许的记录: [root@iZ23rlmiwviZ ~]# cat /etc/sysconfig/iptables # sample configu...
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OpenSuSE 安装bpftrace - 操作系统(内核) - 清泛网 - 专注IT技能提升

...PFTRACE_MAP_KEYS_MAX [default: 4096] max keys in a map BPFTRACE_CAT_BYTES_MAX [default: 10k] maximum bytes read by cat builtin BPFTRACE_MAX_PROBES [default: 512] max number of probes BPFTRACE_LOG_SIZE [default: 409600] log size in bytes BPFTRACE_NO_US...