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/tmp>echo 'echo Hello from the shell' > demo
/tmp>chmod +x demo
...
/tmp>./demo
-bash: ./demo: Permission denied
/tmp>

/tmp>echo '#!/tmp/defrag.exe' > demo
/tmp>echo 'echo Hello from the shell' >> demo
...
/tmp>./defrag.exe
-bash: ./defrag.exe: cannot execute binary file: Exec format error
/tmp>