[Galaxy S 4 i9505 Original Android Development] chenxiaolong:
Are you sure the busybox binary is being extracted? I'm not too familiar with how your app works, so I apologize if I missed something. I see you're running:

tar -xf /data/local/tmp/rlbbox.tar -C /data/local/rlbbox

There are two issues with that:

That command will only work if /data/local/ribbox already exists (you'll need a mkdir)

It doesn't look like you're running that command as root and /data/local/* paths besides /data/local/tmp/ are not writable by apps

EDIT: It's broken because your busybox symlinks are incorrect, causing all the commands, like "rm", to fail:

root@hammerhead:/ # ls -l /data/local/rlbbox/
lrwxrwxrwx root root 2015-03-31 00:33 [ -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 [[ -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 acpid -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 adjtimex -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 arp -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 arping -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ash -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 awk -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 base64 -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 basename -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 beep -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 blkid -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 blockdev -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 brctl -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 bunzip2 -> /data/local/busybox
-rwxrwxrwx root shell 1109128 2015-03-26 15:48 busybox
lrwxrwxrwx root root 2015-03-31 00:33 bzcat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 bzip2 -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 cal -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 cat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 catv -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 chat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 chattr -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 chgrp -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 chmod -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 chown -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 chpst -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 chroot -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 chrt -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 chvt -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 cksum -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 clear -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 cmp -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 comm -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 conspy -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 cp -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 cpio -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 crond -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 crontab -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 cut -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 date -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 dc -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 dd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 deallocvt -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 depmod -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 devmem -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 df -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 diff -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 dirname -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 dmesg -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 dnsd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 dnsdomainname -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 dos2unix -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 du -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 dumpkmap -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 echo -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ed -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 egrep -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 env -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 envdir -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 envuidgid -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ether-wake -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 expand -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 expr -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fakeidentd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 false -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fbset -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fbsplash -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fdflush -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fdformat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fdisk -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fgconsole -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fgrep -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 find -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 findfs -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 flock -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fold -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 free -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 freeramdisk -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fsck -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fsck.minix -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fstrim -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fsync -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ftpd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ftpget -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ftpput -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 fuser -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 getopt -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 grep -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 groups -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 gunzip -> /data/local/rlbbox/unpigz
lrwxrwxrwx root root 2015-03-31 00:33 gzip -> /data/local/rlbbox/pigz
lrwxrwxrwx root root 2015-03-31 00:33 hd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 hdparm -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 head -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 hexdump -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 hostname -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 httpd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 hush -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 hwclock -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 id -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ifconfig -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ifdown -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ifup -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 inetd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 insmod -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 install -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ionice -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 iostat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ip -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ipaddr -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ipcalc -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 iproute -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 iprule -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 iptunnel -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 kbd_mode -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 kill -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 killall -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 killall5 -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 less -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ln -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 loadkmap -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 losetup -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lpd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lpq -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lpr -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ls -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lsattr -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lsmod -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lsof -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lspci -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lsusb -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lzcat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lzma -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lzop -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 lzopcat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 makedevs -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 man -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 md5sum -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 microcom -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mkdir -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mkdosfs -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mke2fs -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mkfifo -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mkfs.ext2 -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mkfs.minix -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mkfs.vfat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mknod -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mkswap -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 modinfo -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 modprobe -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 more -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mount -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mountpoint -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mpstat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 mv -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 nameif -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 nanddump -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 nandwrite -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 nbd-client -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 nc -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 netstat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 nice -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 nmeter -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 nohup -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 nslookup -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ntpd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 od -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 openvt -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 patch -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pgrep -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pidof -> /data/local/busybox
-rwxrwxrwx root shell 58832 2015-03-23 02:10 pigz
lrwxrwxrwx root root 2015-03-31 00:33 ping -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ping6 -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pipe_progress -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pivot_root -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pkill -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pmap -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 powertop -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 printenv -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 printf -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ps -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pscan -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pstree -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pwd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 pwdx -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 raidautorun -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rdate -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rdev -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 readahead -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 readlink -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 readprofile -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 realpath -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 renice -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 reset -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 resize -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rev -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rm -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rmdir -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rmmod -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 route -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rpm -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rpm2cpio -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rtcwake -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 run-parts -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 runsv -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 runsvdir -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 rx -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 script -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 scriptreplay -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sed -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 seq -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 setconsole -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 setkeycodes -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 setlogcons -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 setserial -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 setsid -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 setuidgid -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sha1sum -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sha256sum -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sha3sum -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sha512sum -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 showkey -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 slattach -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sleep -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 smemcap -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 softlimit -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sort -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 split -> /data/local/busybox
-rwxrwxrwx root shell 49884 2015-03-18 14:07 sqlite3
lrwxrwxrwx root root 2015-03-31 00:33 start-stop-daemon -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 stat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 strings -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 stty -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sum -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sv -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 svlogd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 swapoff -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 swapon -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 switch_root -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sync -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 sysctl -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tac -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tail -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tar -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tcpsvd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tee -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 telnet -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 telnetd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 test -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tftp -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tftpd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 time -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 timeout -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 top -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 touch -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tr -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 traceroute -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 traceroute6 -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 true -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tty -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ttysize -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 tunctl -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ubiattach -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ubidetach -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ubimkvol -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ubirmvol -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ubirsvol -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 ubiupdatevol -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 udpsvd -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 umount -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 uname -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 unexpand -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 uniq -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 unix2dos -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 unlzma -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 unlzop -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 unpigz -> /data/local/rlbbox/pigz
lrwxrwxrwx root root 2015-03-31 00:33 unxz -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 unzip -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 uptime -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 usleep -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 uudecode -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 uuencode -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 vconfig -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 vi -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 volname -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 watch -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 watchdog -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 wc -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 wget -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 which -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 whoami -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 whois -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 xargs -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 xz -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 xzcat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 yes -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 zcat -> /data/local/busybox
lrwxrwxrwx root root 2015-03-31 00:33 zcip -> /data/local/busybox
-rwxrwxrwx root shell 226064 2015-03-11 08:42 zip
root@hammerhead:/ #

EDIT: Btw, if you're using SuperSU, the logging feature is extremely useful ;) Make sure you enable logging the command output.