Busybox 将很多 UNIX 下的工具集打包到一个可执行文件中，特别适合小容量的嵌入式设备，Android 等等。最近也是因为在 Android 用到才接触到。

实际的命令列表按编译时的设置决定，在有 Busybox 的系统上执行 busybox --list 即可看到一个完整的列表。

127|:/ $ busybox
BusyBox v1.30.1-osm0sis (2019-02-28 18:48:08 AST) multi-call binary.BusyBox is copyrighted by many authors between 1998-2015.
Licensed under GPLv2. See source distribution for detailed
copyright notices.

Usage: busybox [function [arguments]...]
   or: busybox --list[-full]
   or: busybox --show SCRIPT
   or: busybox --install [-s] [DIR]
   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:
        [, [[, acpid, adjtimex, ar, arch, arp, arping, ash, awk,
        base64, basename, bbconfig, beep, blkdiscard, blkid,
        blockdev, brctl, bunzip2, bzcat, bzip2, cal, cat, chat,
        chattr, chgrp, chmod, chown, chroot, chrt, chvt, cksum,
        clear, cmp, comm, conspy, cp, cpio, crond, crontab,
        cttyhack, cut, date, dc, dd, deallocvt, depmod, devmem, df,
        dhcprelay, diff, dirname, dmesg, dnsd, dnsdomainname,
        dos2unix, du, dumpkmap, dumpleases, echo, ed, egrep, eject,
        env, ether-wake, expand, expr, factor, fakeidentd, false,
        fatattr, fbset, fbsplash, fdflush, fdformat, fdisk,
        fgconsole, fgrep, find, findfs, flock, fold, free,
        freeramdisk, fsck, fsck.minix, fsfreeze, fstrim, fsync,
        ftpd, ftpget, ftpput, fuser, getopt, grep, groups, gunzip,
        gzip, hd, hdparm, head, hexdump, hexedit, hostname, httpd,
        hush, hwclock, id, ifconfig, ifdown, ifenslave, ifplugd,
        ifup, inetd, inotifyd, insmod, install, ionice, iostat, ip,
        ipaddr, ipcalc, ipcrm, ipcs, iplink, ipneigh, iproute,
        iprule, iptunnel, kbd_mode, kill, killall, killall5, klogd,
        less, link, ln, loadfont, loadkmap, logread, losetup, ls,
        lsattr, lsmod, lsof, lspci, lsscsi, lsusb, lzcat, lzma,
        lzop, lzopcat, makedevs, makemime, man, md5sum, mesg,
        microcom, mkdir, mkdosfs, mke2fs, mkfifo, mkfs.ext2,
        mkfs.minix, mkfs.reiser, mkfs.vfat, mknod, mkswap, mktemp,
        modinfo, modprobe, more, mount, mountpoint, mpstat, mv,
        nameif, nanddump, nandwrite, nbd-client, nc, netstat, nice,
        nl, nmeter, nohup, nologin, nslookup, nuke, od, openvt,
        partprobe, paste, patch, pgrep, pidof, ping, ping6,
        pipe_progress, pivot_root, pkill, pmap, popmaildir,
        poweroff, powertop, printenv, printf, ps, pscan, pstree,
        pwd, pwdx, raidautorun, rdate, rdev, readlink, readprofile,
        realpath, reboot, reformime, renice, reset, resize, resume,
        rev, rfkill, rm, rmdir, rmmod, route, rtcwake, run-init,
        run-parts, rx, script, scriptreplay, sed, sendmail, seq,
        setconsole, setfattr, setfont, setkeycodes, setlogcons,
        setpriv, setserial, setsid, setuidgid, sh, sha1sum,
        sha256sum, sha3sum, sha512sum, showkey, shred, shuf,
        slattach, sleep, smemcap, sort, split, ssl_client,
        start-stop-daemon, stat, strings, stty, sum, svc, svok,
        swapoff, swapon, switch_root, sync, sysctl, syslogd, tac,
        tail, tar, tc, tcpsvd, tee, telnet, telnetd, test, tftp,
        tftpd, time, timeout, top, touch, tr, traceroute,
        traceroute6, true, truncate, tty, ttysize, tunctl, tune2fs,
        ubiattach, ubidetach, ubimkvol, ubirename, ubirmvol,
        ubirsvol, ubiupdatevol, udhcpc, udhcpc6, udhcpd, udpsvd,
        uevent, umount, uname, uncompress, unexpand, uniq,
        unix2dos, unlink, unlzma, unlzop, unxz, unzip, uptime,
        usleep, uudecode, uuencode, vconfig, vi, volname, watch,
        watchdog, wc, wget, which, whoami, whois, xargs, xxd, xz,
        xzcat, yes, zcat, zcip
:/ $