Managing users & groups since long but have you ever looked/reviewed the list of users present in a Specific Group after adding them, so here is a single line command for my lazy sysadmins :)
$ getent group | awk -F: '{print $4}'
you may use this when doing a security audit.
Using remote shells is all time favourite but remembering those many passwords is a pain so here are the steps to login using SSH without putting a password :)
1. Create a public ssh key, if you haven’t one already. Look at ~/.ssh. If you see a file named id_dsa.pub then you obviously already have a public key. If not, simply create one.
ssh-keygen -t dsa should do the trick. Please note that there are other types of keys, e.g. RSA instead of DSA.
2. Make sure your .ssh dir is not publically writable
# chmod 700 ~/.ssh
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find .