lua, 61 bytes

Result

INVALID

Duration

675ms

Code [DL]

os.execute("sed '1h;${:1;x;s/ $//;t1;x;:2;s/K /KK/;t2;h};g'")

stdin

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     K                                            

stdout

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     KKKKKKKKKKKKK

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffda7b7bde0 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55bdd2e70d30 /* 7 vars */) = 0
11    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=11, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
12    execve("/usr/bin/lua5.3", ["/usr/bin/lua5.3", "/volume/CODE"], 0x55bdd2e70d40 /* 7 vars */) = 0
13    execve("/bin/sh", ["sh", "-c", "sed '1h;${:1;x;s/ $//;t1;x;:2;s/"...], 0x7fff8ecb71c0 /* 7 vars */) = 0
13    execve("/bin/sed", ["sed", "1h;${:1;x;s/ $//;t1;x;:2;s/K /KK"...], 0x55ee17530d08 /* 7 vars */) = 0
13    +++ exited with 0 +++
12    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
12    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
10    +++ exited with 0 +++