Category Archives: Linux

List openvpn valid certificates (using index.txt)

list_valid_certificates.sh

#!/bin/bash

# Run this script inside openvpn certificates directory.

rm -fv listado_certificados_validos.txt

CNT=`grep ^V index.txt | wc -l`

for i in 6 7
do
 grep ^V index.txt | cut -d / -f $i | sed 's+/emailAddress++g' | grep ^"CN" >> listado_certificados_validos.txt
done

CNT2=`cat listado_certificados_validos.txt | wc -l`

echo -e "-- VALIDANDO DATOS -- \n"

echo -e $CNT $CNT2" \n"

if [ $CNT2 -eq $CNT ]
then
 cat listado_certificados_validos.txt | sort | nl && echo -e "\nOK"
fi

Backup Linux System

#!/bin/bash

# Global Variables
INFO_FILE="info_`hostname`_`date +%Y-%m-%d`"
BACKUP_DIRECTORY="/mnt/backup/Linux"
DIRECTORY_NAME="`hostname`"

# Create backup directory
mkdir -pv $BACKUP_DIRECTORY/$DIRECTORY_NAME

# Output commands backup
echo -e "`hostname` > cat /etc/issue" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
cat /etc/issue >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > uname -a" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
uname -a >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > free -m" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
free -m >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > fdisk -l" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
fdisk -l >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > df -h" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
df -h >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > cat /etc/fstab" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
cat /etc/fstab >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > ifconfig" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
ifconfig >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > netstat -nr" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
netstat -nr >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > cat /etc/rc.local" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
cat /etc/rc.local >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > netstat -tunpl" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
netstat -tunpl >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > pstree" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
pstree >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > crontab -l" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
crontab -l >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > for i in cat /etc/passwd|awk -F: '($3>999 && $3 < 10000 ) {print $1}'; do crontab -l -u $i;done" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
for i in `cat /etc/passwd|awk -F: '($3>999 && $3 < 10000 ) {print $1}'`; do crontab -l -u $i; done >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > iptables -nvL" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
iptables -nvL >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > cat /proc/cpuinfo" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
cat /proc/cpuinfo >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > dmidecode" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
dmidecode >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > lspci" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
lspci >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > lsusb" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
lsusb >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "`hostname` > ls /etc/rc*.d" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
ls /etc/rc*.d >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE
echo -e "\n" >> $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE

# Backup all directories excluding /proc /sys /dev
tar cf $BACKUP_DIRECTORY/$DIRECTORY_NAME/$INFO_FILE.tar / --exclude=/proc --exclude=/sys --exclude=/dev --exclude=/mnt

User Management Commands

SAMBA
smbpasswd -x foo (delete samba user)
smbpasswd -a foo (create samba user)

LINUX
useradd -M foo (create user with no home directory)
useradd -c “name” -M foo (create user with real name)
userdel -r foo (delete user’s files and home directory)
userdel foo (delete only user entry)
usermod -a -G group user (add an existent user to a group)
useradd -g group user (add a new user to a group)
useradd -G group1,group2,group3 user (add user to a list of groups)
groupadd name_group (create a group)
id -nG user (show groups for user)
groupdel (delete an existent group)
adduser (verbose command to create users)

DEFAULT FILES:
default user add file on Red Hat (/etc/default/useradd)
default user add file on Debian (/etc/adduser.conf)