UNIX：“wc”的物理位置命令。它不是“/bin”。
这已经是树桩了。我用 C 语言编写了一个 shell 程序，允许用户执行多个命令。根据我迄今为止的研究，所有命令（例如“ls”和“cat”）都位于“/bin/”中。
“wc”未在此目录“/bin”中列出。如果我启动终端，我可以输入“wc fileName”并且它可以工作。我从“/”目录运行“find .wc”，仍然找不到“wc”命令。
有谁知道“wc”藏在哪里？
This has be stump. I wrote a shell program in C that allows the user to execute several commands. Based on my research so far, all the commands such as "ls" and "cat" are located in "/bin/".
The "wc" is not listed in this directory - "/bin". If I fire up a terminal, I can type "wc fileName" and it works. I ran "find . wc" from the "/" directory, and I still can't find the "wc" command.
Does anyone know where "wc" is hiding?
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尝试在 shell 中输入
which wc...这应该会告诉您它在哪里。在我的机器上，它位于
/bin/中。但是，如果您只想自行完成路径解析，则可以使用
system()函数（有关更多信息，请参阅man 3 system）。正如您在文档中所读到的，这实际上与调用 Bourne shell（或该符号链接指向的任何地方）进行路径解析相同，因此，如果您不希望产生这种开销，那么您将需要坚持使用任何方法您当前正在使用。Try typing
which wcinto your shell...that should tell you where it is.On my machine it is in
/bin/.However, if you just want the path resolution to be done on it's own, you can use the
system()function (seeman 3 systemfor more information). As you can read in the documentation, that's really the same as invoking the Bourne shell (or wherever the symlink for that points to) for the path resolution, so if you don't want that overhead, you will want to stick with whatever method you are currently using.我尝试了
whereis wc并在/usr/bin/wc中找到它I tried
whereis wcand I get it in/usr/bin/wc如果您不想担心各个实用程序在哪里，但确实想避免调用
system所涉及的开销，那么您应该尝试使用中层函数execvp，或其朋友之一（也列在该页面上）。遗憾的是，没有execvpe。If you don't want to worry about where individual utilities are, but you do want to avoid the overhead involved in calling
system, then you should try the middle-level functionexecvp, or one of its friends (also listed on that page). Sadly, there is noexecvpe.您可以尝试使用
whence、which或whereis来查找 exec 路径中的任何程序，具体取决于您使用的 shell。像
wc这样的实用程序通常位于/bin或/usr/bin中，或者像/usr/local/bin< /code> 或/usr/site/bin。You can try
whence,which, orwhereisto find any program in your exec path, depending on which shell you're using.Utilities like
wcare usually located in/binor/usr/bin, or in places like/usr/local/binor/usr/site/bin.