OpenTerm is a sandboxed command line interface for iOS. It is the most popular terminal emulator and SSH/FTP client.
Commands included:
awk cat cd chflags
chksum clear compress cp
credits cub curl date
dig du echo egrep
env fgrep grep gunzip
gzip help host link
ln ls mkdir mv
nc nslookup open copy
paste ping printenv pwd
readlink rlogin rm rmdir
say scp sed setenv
sftp share sleep ssh
ssh-keygen stat sum tar
tee telnet touch tree
uname uncompress unlink unsetenv
uptime wc whoami gps icloud
.....
More commands will be integrated into this fantastic terminal emulator!