Shell Script

[blade_netcom]

I'm still in the process of learning how to write shell scripts. I have a script for adding a user to the system ... Could anyone help me break down this script and explain what each lines does? I would greatly appreciate it!

if [ $(id -u) -eq 0 ]; then
read -p "Enter username : " username
read -s -p "Enter password : " password
egrep "^$username" /etc/passwd >/dev/null
if [ $? -eq 0 ]; then
echo "$username exists!"
exit 1
else
pass=$(perl -e 'print crypt($ARGV[0], "password")' $password)
useradd -m -p $pass $username
[ $? -eq 0 ] && echo "User has been added to system!" || echo "Failed to add a user!"
fi
else
echo "Only root may add a user to the system"
exit 2
fi

[drl]

Hi.

Welcome to the forums.

Most people here would be willing to help with specific questions you might have. I suggest you write a description of what the lines appear to do, and people will attempt to guide you in the right direction.

Let us know what resource you are using -- a book, web page, etc.

Note also the use of CODE tags to make reading easier, like this:

a line of code in mono-space typeface

... cheers, drl