Block many users in a system using a text file as argument
#!/bin/bash
#******************************************************************************#
# BlockManyUsers.sh - Block many users in a system using a text file #
# as argument #
# Copyright (C) 2008 - written by flynets - #
# BlockManyUsers is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# any later version. #
# #
# BlockManyUsers is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see . #
#******************************************************************************#
# Checks if you have the right privileges
if [ "$USER" = "root" ]
then
# Checks if there is an argument
[ $# -eq 0 ] & # checks if there a regular file
[ -f "$1" ] || { echo >&2 ERROR: The input file does not exists. ; exit 1; }
TMPIN=$(mktemp)
# Remove blank lines and delete duplicates
sed '/^$/d' "$1"| sort -g | uniq > "$TMPIN"
# Ask the name of output file
read -p 'Enter the name of output file: ' outname
for user in $(more "$TMPIN"); do
# Checks if the user already exists.
cut -d: -f1 /etc/passwd | grep "$user" > /dev/null
OUT=$?
if [ $OUT -eq 0 ];then
echo >&2 "INFO: OK, user account: \"$user\" exists."
# block selected user
/usr/sbin/usermod -L "$user"
# save user info in a file
echo "The user \"$user\" has been blocked. >> "$outname".txt
else
echo >&2 "Error the user account \"$user\" doesn't exists!" >> "$outname".txt
fi
done
rm -f "$TMPIN"
exit 0
else
echo >&2 "ERROR: You must be a root user to execute this script."
exit 1
fi
