Question

以下两个指挥部在AIX运行时有什么区别?

/bin/sh  ls -l -R 
/bin/sh -c  ls -l -R

Answer 1

在AIX,/bin/sh对Korn壳(ksh)的违约情况。

/bin/sh  ls -l -R

用刀切,把手脚指向执行“<条码>l-R(在现行目录或正轨)”的文字。如果找不到这一名字的文字,就把这一论点作为指挥处理。

请注意,如果无法找到文字,就会产生错误。

/bin/sh -c  ls -l -R

这开始出现新的壳体,告诉它要管理指挥系统<编码>l-R。

Answer 2

(这是针对Phil Ross的,但我需要格式:<>>。

采用我的含水层之一:

sh> /bin/sh --version
GNU bash, version 3.2.39(1)-release (i386-redhat-linux-gnu)
Copyright (C) 2007 Free Software Foundation, Inc.
sh>  /bin/sh  ls -l -R 
/bin/sh: ls -l -R: No such file or directory
sh> /bin/sh ls
/bin/ls: /bin/ls: cannot execute binary file
sh> /bin/sh -c  ls -l | head -1 
total 147296
sh>

利用我的一个热带风暴装置:

sh> /bin/sh --version
GNU bash, version 3.2.49(23)-release (i686-pc-cygwin)
Copyright (C) 2007 Free Software Foundation, Inc.
sh> /bin/sh  ls -l -R 
/bin/sh: ls -l -R: No such file or directory
sh> /bin/sh ls
/usr/bin/ls: /usr/bin/ls: cannot execute binary file
sh> /bin/sh -c  ls -l | head -1 
total 264744
sh>

页: 1

supplying a filename argument to /bin/sh will interpret it as the filename of a shell script and try to execute it
supplying -c with an argument will interpret that argument as a /bin/sh command line and try to execute that

详情,类型

man sh

友情链接