Perl, while it did not replace any single language that was becoming stale, combined features of several little languages like sed, awk, and shell scripts, along with a lot of C-style expressions.
Perl虽然没有取代任何将要陈旧的单个语言，但是它组合了一些小语言，像sed、awk和shell脚本的特性，以及许多c风格的表达式。
If you press Ctrl-C in the shell or the script exits, the cleanup process is performed, which unloads the module and causes all associated utilities to exit.
如果在shell中按组合键ctrl - C或脚本退出，将执行清除进程，这将导致卸载模块并退出所有相关的实用程序。
The two types are the Bourne shell and the C shell, the latter being distinctive because its format and structure is like that of the C programming language.
它们分别是BourneShell和C Shell，后者的独特之处在于其格式和结构类似于 C 编程语言的格式和结构。
Maybe you're a skilled c programmer, and prefer to have a shell that has a similar syntax, and have therefore opted for the C Shell.
也许你是一个经验丰富的C程序员，你肯定愿意使用和c语法相似的shell，所以最佳的选择就是C Shell。
The Bourne shell is easier to use and understand than the C shell, but it is less practical for the complex script programming that you might want to achieve within the shell programming environment.
BourneShell比C Shell更容易使用和理解，但是对于您可能希望在 Shell编程环境中实现的复杂脚本编程，它可能就不太实用了。
The C shell uses a "C-like" syntax and has borrowed many features from the Bourne shell, but uses a different set of internal shell commands.
C shell使用的是“类C”语法，借鉴了Bourne shell 的许多特点，只是内部 shell 命令集有所不同。
If a user's PATH is set to a: B: c: d, the shell first attempts to find the command in directory A. If it isn't found there, the shell moves on to look in directory B and so on.
如果用户的PATH被设置为A：B：C：D，那么shell将首先尝试在目录a中查找命令。
If a user's PATH is set to a: B: c: d, the shell first attempts to find the command in directory A. If it isn't found there, the shell moves on to look in directory B and so on.
如果用户的PATH被设置为A：B：C：D，那么shell将首先尝试在目录a中查找命令。
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