Bash is the shell (command language interpreter). Basically it understands and runs the .SH scripts and runs the commands in telnet. There are different shells for linux, but Bash is the most famous and widely used
Python is an object-oriented programming language that can be used for software development. It's not so much popular, but it is very powerful. Very good for further software developers
Busybox combines many programs (utilities) into a single small executable, which makes it a very powerful telnet tool. Here are they:
[, [[, addgroup, adduser, adjtimex, ar, arping, ash, awk,
basename, bbconfig, bunzip2, busybox, bzcat, cal, cat, catv,
chattr, chgrp, chmod, chown, chroot, chvt, cksum, clear, cmp,
comm, cp, cpio, crond, crontab, cut, date, dc, dd, deallocvt,
delgroup, deluser, devfsd, df, diff, dirname, dmesg, dnsd,
dos2unix, dpkg, dpkg_deb, du, dumpkmap, dumpleases, e2fsck, echo,
ed, eject, env, ether_wake, expr, fakeidentd, false, fbset,
fdflush, fdformat, fdisk, find, fold, free, freeramdisk, fsck,
fsck_minix, ftpget, ftpput, fuser, getopt, getty, grep, gunzip,
gzip, halt, hdparm, head, hexdump, hostid, hostname, httpd,
hwclock, id, ifconfig, ifdown, ifup, inetd, init, insmod,
install, ip, ipaddr, ipcalc, ipcrm, ipcs, iplink, iproute,
iptunnel, kill, killall, klogd, lash, last, length, less, ln,
loadfont, loadkmap, logger, login, logname, logread, losetup, ls,
lsattr, lsmod, lzmacat, makedevs, md5sum, mdev, mesg, mkdir,
mke2fs, mkfifo, mkfs_minix, mknod, mkswap, mktemp, modprobe,
more, mount, mountpoint, mt, mv, nameif, nc, netstat, nice,
nohup, nslookup, od, openvt, passwd, patch, pidof, ping, ping6,
pivot_root, poweroff, printenv, printf, ps, pwd, rdate, readlink,
readprofile, realpath, reboot, renice, reset, rm, rmdir, rmmod,
route, rpm, rpm2cpio, run_parts, runlevel, rx, sed, seq, setarch,
setconsole, setkeycodes, setlogcons, setsid, sha1sum, sleep,
sort, start_stop_daemon, stat, strings, stty, su, sulogin, sum,
swapoff, swapon, switch_root, sync, sysctl, syslogd, tail, tar,
tee, telnet, telnetd, test, tftp, time, top, touch, tr,
traceroute, true, tty, tune2fs, udhcpc, udhcpd, umount, uname,
uncompress, uniq, unix2dos, unlzma, unzip, uptime, usleep,
uudecode, uuencode, vconfig, vi, vlock, watch, watchdog, wc,
wget, which, who, whoami, xargs, yes, zcat, zcip
