/usr/share/texmf-texlive/scripts/cachepic/cachepic.cmd is in texlive-pictures 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | @echo off
setlocal enableextensions
if not defined LUA_EXE if exist "%~dp0lua.exe" set LUA_EXE=%~dp0lua.exe
for %%I in (lua.exe texlua.exe) do if not defined LUA_EXE set LUA_EXE=%%~$PATH:I
if not defined LUA_EXE goto :nolua
"%LUA_EXE%" "%~dp0cachepic.tlu" %*
goto :eof
:nolua
echo %~nx0: could not locate lua nor texlua interpreter>&2
exit /b 1
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