'перенаправить' путь ssh?

Если Вы находитесь в оболочке busybox (пепел), Вы не должны волноваться о псевдонимах, когда они будут выполнены как команды по умолчанию IIRC. Так или иначе busybox --help дает список поддерживаемых команд. В моем случае они:

% busybox --help
BusyBox v1.17.4 (2010-11-25 12:49:55 GMT) multi-call binary.
Copyright (C) 1998-2009 Erik Andersen, Rob Landley, Denys Vlasenko
and others. Licensed under GPLv2.
See source distribution for full notice.

Usage: 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:
    [, [[, acpid, addgroup, adduser, adjtimex, ar, arp, arping, ash, awk,
    basename, bb, bbconfig, bbsh, beep, blkid, bootchartd, brctl, bunzip2,
    bzcat, bzip2, cal, cat, catv, chat, chattr, chgrp, chmod, chown,
    chpasswd, chpst, chroot, chrt, chvt, cksum, clear, cmp, comm, conspy,
    cp, cpio, crond, cryptpw, cttyhack, cut, date, dd, deallocvt, delgroup,
    deluser, depmod, devmem, df, dhcprelay, diff, dirname, dmesg,
    dnsdomainname, dos2unix, dpkg-deb, du, dumpkmap, dumpleases, echo, ed,
    egrep, eject, env, envdir, envuidgid, ether-wake, expand, expr, false,
    fbset, fdflush, fdformat, fdisk, fgconsole, fgrep, find, findfs,
    flash_eraseall, flash_lock, flash_unlock, flashcp, flock, free,
    freeramdisk, fsck, fsck.minix, fsync, ftpd, fuser, getopt, getty, grep,
    gunzip, gzip, halt, hd, hdparm, head, hexdump, hostname, httpd,
    hwclock, id, ifconfig, ifdown, ifenslave, ifplugd, ifup, init, insmod,
    install, ionice, ip, ipaddr, ipcrm, ipcs, iplink, iproute, iprule,
    iptunnel, kbd_mode, kill, killall, killall5, klogd, last, length, less,
    linux32, linux64, linuxrc, ln, loadfont, loadkmap, logger, login,
    logread, losetup, lpq, lpr, ls, lsattr, lsmod, lspci, lsusb, lzcat,
    lzma, lzop, lzopcat, makedevs, makemime, man, md5sum, mdev, mesg,
    microcom, mkdir, mkdosfs, mke2fs, mkfifo, mkfs.ext2, mkfs.minix,
    mkfs.reiser, mkfs.vfat, mknod, mkpasswd, mkswap, mktemp, modinfo,
    modprobe, more, mount, mountpoint, mt, mv, nameif, nc, netstat, nice,
    nmeter, nohup, nslookup, ntpd, openvt, passwd, patch, pgrep, pidof,
    ping, ping6, pipe_progress, pivot_root, pkill, popmaildir, poweroff,
    printenv, printf, ps, pscan, pwd, raidautorun, rdate, rdev, readahead,
    readlink, readprofile, realpath, reboot, reformime, renice, reset,
    resize, rev, rm, rmdir, rmmod, route, rtcwake, run-parts, runlevel,
    runsv, runsvdir, rx, script, scriptreplay, sed, sendmail, seq, setarch,
    setconsole, setfont, setkeycodes, setlogcons, setsid, setuidgid, sh,
    sha1sum, sha256sum, sha512sum, showkey, sleep, smemcap, softlimit,
    sort, split, start-stop-daemon, stat, strings, stty, su, sum, sv,
    svlogd, swapoff, swapon, switch_root, sync, sysctl, syslogd, tac, tail,
    tar, tee, telnet, telnetd, test, tftp, tftpd, time, timeout, top,
    touch, tr, traceroute, traceroute6, true, tty, ttysize, tunctl,
    tune2fs, ubiattach, ubidetach, udhcpc, udhcpd, umount, uname,
    uncompress, unexpand, uniq, unix2dos, unlzma, unlzop, unxz, unzip,
    uptime, usleep, vconfig, vi, vlock, volname, wall, watch, watchdog, wc,
    wget, which, who, whoami, xargs, xz, xzcat, yes, zcat, zcip

В случае первого метода Вы создаете mknod(1) команда. Например:

# mknod /my/dir/with/initrd/dev/console -m 644 c 5 0