Minecraft Forge

When I try to open minecraft forge using the terminal, I keep getting an error that it is unable to access the file.

chrx@chrx:~$ java -jar forge-1.7.10-10.13.4.1614-1.7.10-installer.jar

Error: Unable to access jarfile forge-1.7.10-10.13.4.1614-1.7.10-installer.jar

That’s the error.
Please help me! D: