Why Does `exec.Command('mv')` Fail with Wildcards in Go, and How Can I Fix It?

Why is Exec Command Failing for a MV Wildcard in Go?

When attempting to execute a mv command using the exec package in Go, you may encounter an error if the command includes a wildcard asterisk (*) for selecting multiple files. This issue arises because the Go runtime does not interpret the asterisk as a wildcard, unlike the shell.

To resolve this issue, you have two options:

Option 1: Manually Expand Wildcards

You can manually expand the wildcards yourself using the filepath.Glob() function, which returns a slice of matching file paths. Here's how you would do it:

import (
    "filepath/glob"
    "os/exec"
)

cmd := exec.Command("mv")
files, err := glob.Glob("./source-dir/*")
if err != nil {
    // Handle error
}
args := []string{"--", "./dest-dir"}
args = append(args, files...)
cmd.Args = args

output, err := cmd.CombinedOutput()

Option 2: Invoke the Shell

Alternatively, you can invoke the shell and let it do the wildcard expansion for you. Here's how you would do it:

import (
    "os/exec"
)

cmd := exec.Command("sh", "-c", "mv ./source-dir/* ./dest-dir")
output, err := cmd.CombinedOutput()

This approach leverages the shell's own wildcard handling capabilities.

Recursive File Movement

If you need to recursively move all files from one directory to another, you can use the filepath.Walk() function to iterate through the source directory and execute the mv command for each subdirectory and file encountered.

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