我的问题是:
为什么要运行带有名称别名的文件,例如具有以下内容的文件:
alias lsa="ls -a"
直接地:
$ ./aliases
它不会创建别名(可能仅在脚本上下文中)。
但是,如果我使用命令“ source”运行它:
$ source aliases
它做的工作吗?我的意思是执行后在命令外壳上下文中存在别名“ lsa”吗?
“ man源代码”给出:“没有手动输入源代码”,在google中,我刚刚发现它运行Tcl,但是为什么Tcl影响外壳上下文而不影响套管?
基本上是因为当您运行时./aliases
,它将创建一个进程,该进程中存在您的别名,但别名会在此之后立即终止,而当您运行source
时,它将应用于您当前的bash进程。
要获得帮助source
,您需要阅读man bash
。为您省去麻烦:
source filename [arguments]
Read and execute commands from filename in the current shell environment
and return the exit status of the last command executed from filename.
If filename does not contain a slash, file names in PATH are used to find
the directory containing filename. The file searched for in PATH need not
be executable. When bash is not in posix mode, the current directory is
searched if no file is found in PATH. If the sourcepath option to the shopt
builtin command is turned off, the PATH is not searched. If any arguments
are supplied, they become the positional parameters when filename is
executed. Otherwise the positional parameters are unchanged. The return
status is the status of the last command exited within the script (0 if
no commands are executed), and false if filename is not found or cannot
be read.
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