[jpstewart]

the first picture are make with command "find / l grep libInventor.so.3" in root shell.

No, it was not.  It was the output of "find / I grep libInventor.so.3".  The character before "grep" is supposed to be a vertical bar (pipe symbol, in Unix shell terminology) but you clearly typed "I" (capital letter i) instead in that picture and the post itself.

FWIW, instead of piping the output of find to grep, you could use "find / -name \*libInventor.so.3\* -print" to achieve the same result (which is anything containing "libInventor.so.3" in the name).  Or just "find / -name libInventor.so.3 -print" to exactly match the filename.