how to search the memory for the address of bin/sh

     (gdb) break main
     (gdb) run
     (gdb) print &system
     $1 = (<text variable, no debug info> *) 0xf7e68250 <system>
     (gdb) find &system,+9999999,"/bin/sh"
     0xf7f86c4c
     warning: Unable to access target memory at 0xf7fd0fd4, halting search.
     1 pattern found.