linux - Linux 中的特殊符号

Question

$1 的用途是什么？在执行 java 文件时，我们将把它作为命令行参数。它指的是什么？

Answer 1

您在这里提供了一些上下文，但我认为这是 shell 参数。

ARGUMENTS

If arguments remain after option processing, and neither the -c nor the -s option has been supplied, the first argument is assumed to be the name of a file containing shell commands. If bash is invoked in this fashion, $0 is set to the name of the file, and the positional parameters are set to the remaining arguments. Bash reads and executes commands from this file, then exits. Bash's exit status is the exit status of the last command executed in the script. If no commands are executed, the exit status is 0. An attempt is first made to open the file in the current directory, and, if no file is found, then the shell searches the directories in PATH for the script.

有关更多详细信息，请尝试 man bash。

示例

$ cat ./test.sh 
#!/bin/bash
echo $0
echo $@
$ ./test.sh hello world
./test.sh
hello world