C one-liners

/lib/ld-linux.so.2 =(echo -e '#include <stdio.h>\nint main(){printf("c one liners\\n");}' | gcc -x c -o /dev/stdout -)
/lib/ld-linux.so.2 is the runtime linker/loader for ELF binaries on Linux. =(cmd) is a zsh trick to take the output for the command "inside" it and save it to a temporary file. echo -e 'blah' | gcc -x c -o /dev/stdout - pipes the C source to gcc. -x c tells gcc that it's compiling C (which is required if it's reading from a pipe). -o /dev/stdout - tells it to write the binary to standard output and read the source from standard input. because of the the =() thing, the compiled output is stashed in a tempfile, which the loader then runs and executes, and the shell tosses the tempfile away immediately after running it.
Sample Output
c one liners

6
2009-02-20 06:06:29

What Others Think

use /lib/ld-linux-x86-64.so.2 for AMD64 and other 64bit OSes.
nadavkav · 486 weeks ago
Does anyone have a bash adaption of this?
matthewbauer · 456 weeks and 3 days ago
I would think something like: echo -e "#include <stdio.h>\nint main(){printf(\"c on liners\");}" | gcc -x c -o /dev/stdout - | /lib/ld-linux.so.2 /dev/stdin would work but it doesn't.
matthewbauer · 455 weeks and 3 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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