Welcome to Buildroot
buildroot login:

# busybox
BusyBox v1.17.4 (2010-12-23 12:24:48 MSK) multi-call binary.
Copyright (C) 1998-2009 Erik Andersen, Rob Landley, Denys Vlasenko
and others. Licensed under GPLv2.
See source distribution for full notice.

age: busybox [function] [arguments]...
   or: function [arguments]...

    BusyBox is a multi-call binary that combines many common Unix
    utilities into a single executable.  Most people will create a
    link to busybox for each function they wish to use and BusyBox
    will act like whatever it was invoked as.

Currently defined functions:
    [, [[, addgroup, adduser, ar, arping, ash, awk, basename, bunzip2,
    bzcat, cat, catv, chattr, chgrp, chmod, chown, chroot, chrt, chvt,
    cksum, clear, cmp, cp, cpio, crond, crontab, cut, date, dc, dd,
    deallocvt, delgroup, deluser, devmem, df, diff, dirname, dmesg, dnsd,
    dnsdomainname, dos2unix, du, dumpkmap, echo, egrep, eject, env,
    ether-wake, expr, false, fdflush, fdformat, fgrep, find, fold, free,
    freeramdisk, fsck, fuser, getopt, getty, grep, gunzip, gzip, halt,
    hdparm, head, hexdump, hostid, hostname, hwclock, id, ifconfig, ifdown,
    ifup, inetd, init, insmod, install, ip, ipaddr, ipcrm, ipcs, iplink,
    iproute, iprule, iptunnel, kill, killall, killall5, klogd, last,
    length, less, linux32, linux64, linuxrc, ln, loadfont, loadkmap,
    logger, login, logname, losetup, ls, lsattr, lsmod, lspci, lsusb,
    lzcat, lzma, makedevs, md5sum, mdev, mesg, microcom, mkdir, mkfifo,
    mknod, mkswap, mktemp, modprobe, more, mount, mountpoint, mt, mv,
    nameif, netstat, nice, nohup, nslookup, od, openvt, passwd, patch,
    pidof, ping, pipe_progress, pivot_root, poweroff, printenv, printf, ps,
    pwd, rdate, readlink, readprofile, realpath, reboot, renice, reset,
    resize, rm, rmdir, rmmod, route, run-parts, runlevel, sed, seq,
    setarch, setconsole, setkeycodes, setlogcons, setsid, sh, sha1sum,
    sha256sum, sha512sum, sleep, sort, start-stop-daemon, strings, stty,
    su, sulogin, swapoff, swapon, switch_root, sync, sysctl, syslogd, tail,
    tar, tee, telnet, test, tftp, time, top, touch, tr, traceroute, true,
    tty, udhcpc, umount, uname, uniq, unix2dos, unlzma, unxz, unzip,
    uptime, usleep, uudecode, uuencode, vconfig, vi, vlock, watch,
    watchdog, wc, wget, which, who, whoami, xargs, xz, xzcat, yes, zcat

Empty flash at 0x01227854 ends at 0x01228000
Empty flash at 0x01230804 ends at 0x01231000
VFS: Mounted root (jffs2 filesystem) on device 31:0.
Freeing init memory: 124K
...
...
JFFS2 notice: (360) check_node_data: wrong data CRC in data node at 0x012307b8: read 0x186b259f, calculated 0xef3d92a5.
...
Welcome to Buildroot
buildroot login:

# ls --help
BusyBox v1.17.4 (2010-12-23 12:24:48 MSK) multi-call binary.

Usage: ls [-1AacCdeFilnpLRrSsTtuvwxXhk] [FILE]...

List directory contents

Options:
    -1    List in a single column
    -A    Don't list . and ..
    -a    Don't hide entries starting with .
    -C    List by columns
    -c    With -l: sort by ctime
    --color[={always,never,auto}]    Control coloring
    -d    List directory entries instead of contents
    -e    List full date and time
    -F    Append indicator (one of */=@|) to entries
    -i    List inode numbers
    -l    Long listing format
    -n    List numeric UIDs and GIDs instead of names
    -p    Append indicator (one of /=@|) to entries
    -L    List entries pointed to by symlinks
    -R    Recurse
    -r    Sort in reverse order
    -S    Sort by file size
    -s    List the size of each file, in blocks
    -T N    Assume tabstop every N columns
    -t    With -l: sort by modification time
    -u    With -l: sort by access time
    -v    Sort by version
    -w N    Assume the terminal is N columns wide
    -x    List by lines
    -X    Sort by extension
    -h    List sizes in human readable format (1K 243M 2G)

# ls -l
total 0
#

ls /

ls /bin