title: ELF file exists in /usr/bin but turns out "-ash: file: not found"
body: <p>i'm trying to install some new software package under openwrt using opkg,and the installation has been successful,and we can see the binary file really exists in the /usr/bin,and i have trird the lld check but turns out the same . as below:</p>
  
  <pre><code>root@OpenWrt /usr/bin [#]# opkg files cfdisk
  Package cfdisk (2.25.2-4) is installed on root and has the following files:
  /usr/sbin/cfdisk
  root@OpenWrt /usr/bin [#]# ls /usr/sbin/
  adjtimex                arping                  ethtool                 iptables-save           mkfs.ext3               pppd                    telnetd
  airbase-ng              besside-ng              fdisk                   iw                      mkfs.ext4               rate.awk                uhttpd
  aireplay-ng             brctl                   hostapd                 iwconfig                modinfo                 rmmod                   wpa_supplicant
  airmon-ng               cfdisk                  insmod                  iwlist                  modprobe                samba_multicall         wpad
  airmon-zc               chroot                  ip6tables               iwpriv                  nmbd                    smbd                    xtables-multi
  airodump-ng             crond                   ip6tables-restore       lsmod                   ntpclient               smbpasswd
  airodump-ng-oui-update  dnsmasq                 ip6tables-save          miniupnpd               ntpd                    swapoff
  airserv-ng              dropbear                iptables                mke2fs                  odhcp6c                 swapon
  airtun-ng               e2fsck                  iptables-restore        mkfs.ext2               pdnsd                   tc
  root@OpenWrt /usr/bin [#]# cfdisk
  -ash: cfdisk: not found
  root@OpenWrt /usr/bin [#]# ./cfdisk
  -ash: ./cfdisk: not found
  root@OpenWrt /usr/bin [#]# ldd cfdisk
  -ash: cfdisk: not found
  root@OpenWrt /usr/bin [#]# ldd id
          libcrypt.so.0 =&gt; /lib/libcrypt.so.0 (0x77898000)
          libm.so.0 =&gt; /lib/libm.so.0 (0x77872000)
          libgcc_s.so.1 =&gt; /lib/libgcc_s.so.1 (0x7784e000)
          libc.so.0 =&gt; /lib/libc.so.0 (0x777e2000)
          ld-uClibc.so.0 =&gt; /lib/ld-uClibc.so.0 (0x778bc000)
  root@OpenWrt /usr/bin [#]# export
  export HOME='/root'
  export LOGNAME='root'
  export OLDPWD='/usr'
  export PATH='/usr/bin:/usr/sbin:/bin:/sbin'
  export PS1='\[\033[35;1m\]\u\[\033[0m\]@\[\033[31;1m\]\h \[\033[32;1m\]$PWD\[\033[0m\] [\[\033[35m\]\#\[\033[0m\]]\[\033[31m\]\$\[\033[0m\] '
  export PWD='/usr/bin'
  export SHELL='/bin/ash'
  export SHLVL='1'
  export SSH_CONNECTION='192.168.1.152 29105 192.168.1.1 22'
  export SSH_TTY='/dev/pts/0'
  export TERM='xterm'
  export USER='root'
  root@OpenWrt /usr/bin [#]# 
  </code></pre>
  
  <p>thanks.</p>