added 'command' shell command

cmd/command.go

@@ -0,0 +1,28 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+func Command(cmd string) (string, error) {
+
+	command := exec.Command("command", "-v", cmd)
+
+	outputBytes, err := command.Output()
+	if err != nil {
+		var exitErr *exec.ExitError
+		if errors.As(err, &exitErr) {
+			if exitErr.ExitCode() == 1 {
+				return "", ErrNotFound
+			} else {
+				return "", fmt.Errorf("command error: %w", err)
+			}
+		}
+	}
+
+	return strings.Trim(string(outputBytes), "\n"), nil
+
+}

tes.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"errors"
+	"git.shadowhosting.xyz/Eggactyl/shell/linux"
+	"log"
+)
+
+func main() {
+
+	cmd, err := linux.NewCommand(linux.CommandOptions{
+		Command: "./package",
+		//Sources: []string{"./nvm.sh"},
+		Args: []string{"install"},
+		CustomErrors: map[int8]error{
+			1: errors.New("failed to download package"),
+		},
+		//Cwd: "/home/<user>/<dir>",
+		//Shell: "/bin/bash",
+	})
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if err := cmd.Run(); err != nil {
+		log.Fatal(err)
+	}
+
+}