starry, 173 bytes

Result

AC

Duration

863ms

Code [DL]

` , + .        +    *'     + `                                                      +  `  + + ,* + .        +    *   '      +*   `  + +      + *  +  ' ,  + * . +       + * '

Disassembly

[[:label, 0],
 [:char_in],
 [:dup],
 [:char_out],
 [:push, 3],
 [:%],
 [:jump, 0],
 [:push, 0],
 [:label, 1],
 [:push, 49],
 [:label, 2],
 [:swap],
 [:dup],
 [:char_in],
 [:+],
 [:dup],
 [:char_out],
 [:push, 3],
 [:%],
 [:jump, 3],
 [:push, 1],
 [:+],
 [:label, 3],
 [:swap],
 [:dup],
 [:push, 1],
 [:-],
 [:swap],
 [:jump, 2],
 [:char_in],
 [:swap],
 [:-],
 [:char_out],
 [:dup],
 [:push, 2],
 [:-],
 [:jump, 1]]

stdin

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         K                                        

stdout

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         K!"""""""""""""!

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff072cf5a0 /* 9 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x5633c8f52d70 /* 9 vars */) = 0
13    execve("/usr/local/ruby-2.6.3/bin/ruby", ["/usr/local/ruby-2.6.3/bin/ruby", "/root/starry.rb", "/volume/CODE"], 0x5633c9317068 /* 9 vars */) = 0
12    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=10, si_stime=1} ---
11    +++ exited with 0 +++