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 useradd zhang

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 passwd zhang

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#!/bin/bash
USER_LIST=$@
USER_FILE=./user.info
for USER in $USER_LIST;do
	if ! id $USER &>/dev/null; then
		PASS=$(echo $RANDOM |md5sum |cut -c 1-8)
		useradd $USER
		echo $PASS | passwd --stdin $USER &>/dev/null
		echo "$USER   $PASS" >> $USER_FILE
		echo "$USER User create successful."
	else
		echo "$USER User already exists!"
	fi
done

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./user.sh li zhang wei wu yi