Executable parsing of exec.Command + PATH

php Xiaobian Yuzai today introduces to you a key issue related to exec.Command and PATH - executable parsing. In PHP, the exec.Command function is one of the commonly used functions for executing external commands, and PATH is the system environment variable used to specify the directory where the system searches for executable files. When using the exec.Command function to execute external commands, you sometimes encounter the problem that the executable file cannot be found. In this case, you need to set the PATH correctly to ensure that the system can correctly resolve the path of the executable file. Below we will discuss in detail how to set PATH correctly, as well as common parsing problems and solutions.

Question content

Have very similar command calls

cmddirect := exec.command("theexecutable")
cmdshell := exec.command(os.getenv("shell"),  "-c",  "theexecutable")

Both have the same environment settings

envwithpath := append(os.environ(), fmt.sprintf("path=/real/existing/path/to/theexecutable/holder:%s", os.getenv("path")))

cmddirect.env = envwithpath
cmdshell.env = envwithpath

Although cmdshell works fine as expected, cmddirect fails

exec: "theexecutable": executable file not found in $path

The call also succeeded for the exact same environment settings mentioned

cmdwhich := exec.command("which", "theexecutable")

Return correctly /real/existing/path/to/theexecutable/holder/theexecutable

So what is the reason for this difference?

P.S. Both methods must have the same $path settings. For example

exec.Command("env")
exec.Command(os.GetEnv("SHELL"),  "-c",  "env")

Both output the same path=.... sequence

Thank you

Workaround

exec.Command Use exec.LookPath to find the path to the executable using your PATH , instead of the path set on cmd.

If you want to find a specific executable more reliably (or spawn a subshell), I recommend setting Cmd.Path to the path to the executable.

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