var ErrNotFound … type Cmd … type Error … type ExitError … func relError(file, path string) error { … } // LookPath searches for an executable named file in the directories // named by the PATH environment variable. If file contains a slash, // it is tried directly and the PATH is not consulted. The result will be // an absolute path. // // LookPath differs from exec.LookPath in its handling of PATH lookups, // which are used for file names without slashes. If exec.LookPath's // PATH lookup would have returned an executable from the current directory, // LookPath instead returns an error. func LookPath(file string) (string, error) { … } func fixCmd(name string, cmd *exec.Cmd) { … } // CommandContext is like Command but includes a context. // // The provided context is used to kill the process (by calling os.Process.Kill) // if the context becomes done before the command completes on its own. func CommandContext(ctx context.Context, name string, arg ...string) *exec.Cmd { … } // Command returns the Cmd struct to execute the named program with the given arguments. // See exec.Command for most details. // // Command differs from exec.Command in its handling of PATH lookups, // which are used when the program name contains no slashes. // If exec.Command would have returned an exec.Cmd configured to run an // executable from the current directory, Command instead // returns an exec.Cmd that will return an error from Start or Run. func Command(name string, arg ...string) *exec.Cmd { … }
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