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An "exec format error" usually indicates that the operating system can't execute a file because it's not in a format the system understands. This is most often seen when running binaries compiled for a different architecture or when trying to execute a script without a valid interpreter. For example, if you download a program compiled for Windows and try to run it directly on Linux, or if you use an ARM binary on an x86_64 machine, you’ll likely hit this error. Similarly, a script without a proper shebang line (like #!/bin/sh or #!/usr/bin/env python3) can cause the system to misinterpret the file type. To fix this, use file to inspect the binary format and ensure it matches your system’s architecture (check with uname -m). If you're running a script, add the correct shebang at the top and make sure it’s executable with chmod +x script.sh. For incompatible binaries, consider using a compatible build or an emulator like QEMU.