Practical task: the binary 2.1.out does not run. You need to figure out why, using only the terminal and the binary itself.

To diagnose why the binary 2.1.out does not run, you can use the following steps in the terminal:

1. Check execution permissions:

ls -l 2.1.out

If there are no execute permissions, add them:

chmod +x 2.1.out

2. Run the binary and observe the error:

./2.1.out

3. Use file to determine the binary type:

file 2.1.out

4. Check dependencies (if Linux, use ldd):

ldd 2.1.out

If you see "not found" — libraries are missing.

5. Use strace to trace system calls and errors:

strace ./2.1.out

6. Check architecture and system compatibility:

uname -m

Compare this with the architecture of the binary from file.

These steps will help identify the cause, such as missing permissions, architecture incompatibility, missing libraries, or runtime errors.