How Linux Shell executes

There are two ways that Linux shell executes

Shell scripts start with #!/bin/bash, and the shell is executed with the first row checked and executed internally in the following ways:

$/bin/bash script.sh

1. Execute with SH.

$sh script.sh #脚本位于当前目录下

Or

$sh/home/path/script.sh #使用完整路径

2. Run the script independently.

You need to have executable permissions that can be set in the following way

$chmod a+x script.sh

Or

$chmod 755 script.sh

This can then be done in the following ways:

$./script.sh #./represents the current directory

Or

$/home/path/script.sh #使用完整路径

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Appendix: chmod Command

chmod [-CFVR] [--help] [--version] Mode file ...

chmod owner Group World FileName

4–read (R)
2–write (W)
1–execute (x)

7 = 4+2+1 (Read/write/execute)
6 = 4+2 (read/write)
5 = 4+1 (Read/execute)
4 = 4 (Read)
3 = 2+1 (Write/execute)
2 = 2 (write)
1 = 1 (execute)

+ indicates an increase in permissions,-represents a cancellation permission, = Represents a unique set of permissions