Sys.which(base)
Sys.which()所属R语言包：base
Find Full Paths to Executables
找到可执行文件的完整路径
译者：生物统计家园网 机器人LoveR
描述----------Description----------
This is an interface to the system command which.
这是一个系统命令which的接口。
用法----------Usage----------
Sys.which(names)
参数----------Arguments----------
参数：names
Character vector of names of possible executables.
特征向量可能的可执行文件的名称。
Details
详情----------Details----------
The system command which reports on the full names of an executable (including an executable script) found on the current path.
系统命令which报告对当前路径上发现了一个可执行文件（包括可执行脚本）的全名。
On Windows an "executable" is a file with extension ".exe", ".com", ".cmd" or ".bat". Such files need not actually be executable, but they are what system tries.
Windows上的“可执行文件”是一个文件扩展名为.exe，.com，.cmd或.bat＆rsquo ;这些文件需要实际上是可执行文件，但他们是什么system尝试。
On a Unix-alike the full path to which (usually "/usr/bin/which") is found when R is installed and (currently) stored in environment variable WHICH.
在Unix一样的完整路径which（通常是/usr/bin/which）被发现，当R安装和环境变量WHICH（目前）存储。
值----------Value----------
A character vector of the same length as names, named by names. The elements are either the full path to the executable or some indication that no executable of that name was found. Typically the indication is "", but this does depend on the OS (and the known exceptions are changed to "").
namesnames命名，同样长度的一个特征向量。元素的完整路径的可执行文件或一些没有该名称的可执行文件被发现的迹象。典型的标志是""，但这取决于操作系统（和已知的异常改变""）。
The paths will be short paths (8+3 components, no spaces) with \ as the path delimiter.
路径将是短路径（8 +3个组成部分，没有空格）\作为路径分隔符。
举例----------Examples----------
## the first two are likely to exist everywhere[＃前两个可能到处存在]
## texi2dvi exists on most Unix-alikes and under MiKTeX[＃texi2dvi存在在大多数Unix相似者下MiKTeX]
Sys.which(c("ftp", "ping", "texi2dvi", "this-does-not-exist"))
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注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
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发表于 2012-2-17 10:12:25
