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backup mysql users 

3 steps to install perconal utility...

yum install perl-DBI perl-Data-Dumper perl-DBD-MySQL

wget percona.com/get/pt-show-grants

perl pt-show-grants -h 1.2.3.4 -uroot -pPasswd

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clear tmp folder

Here is following commands to clear unwanted stuff from the /tmp partition on the server?

tmpwatch –mtime –all 48 /tmp

The above command will remove all files and folders from the /tmp which have not been accessed in the last couple of days (24×2=48). You can modify the number of hours as required.

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change your server time to IST

If you need to change your server clock to another timezone for e.g. (Indian Standard Time), you can do so by modifying the /etc/localtime file:

mv /etc/localtime /etc/localtime.bak

ln -s /usr/share/zoneinfo/Asia/Calcutta /etc/localtime

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Transfer root emails to another email address

If you have root access to the server then open the file /etc/aliases in your favorite editor. Look for the section Person who should get root mail and make the change as required.

vim /etc/aliases

Person who should get root’s mail ##
root: info@unixserveradmin.com

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special strings in cron

Instead of the first five fields, you can use any one of eight special strings. It will not just save your time but it will improve readability.

Special string Meaning
@reboot ——> Run once, at startup.
@yearly ——> Run once a year, “0 0 1 1 ”.
@annually –> (same as @yearly)
@monthly —> Run once a month, “0 0 1
”.
@weekly —–> Run once a week, “0 0
0″.
@daily ——–> Run once a day, “0 0
”.
@midnight –> (same as @daily)
@hourly —–> Run once an hour, “0 ”.

For e.g. run ntpdate every hour:
@hourly /path/to/ntpdatevim /etc/ssh/sshd_config

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while loop

This is a sample shell script while loop

while read mydb
do
echo "time scp /home/backup/mysql/$mydb/ticket.txt.gz 1.2.3.4:/tmp/$mydb.txt.gz "
done << dblist
akolaII
akol
ako
dblist

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Selecting from error log

grep "error" error_log |awk -F[ {'print $4'} \
| sort | sed -e 's/]//g' | grep -v "/var/www/html/" \
| grep -v "/usr/local/src/code" | awk {'print $2'} \
| grep -v "75.142.246.205" |uniq | awk -F. {'print $1"."$2"."$3"/24"'} |uniq

114.80.93/24
119.63.193/24
124.115.0/24
205.234.253/24

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mysql and shell command

date -d"-1 day ago" +'%b%d'

equals to

mysql -Bse"select date_format(date(date_add(now() , interval 1 day)),'%b%d')"

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find dead processes

The 8th column of ps aux command will list the status of the process.

ps aux | awk '{if ($8 ~ "D") print $0}'

Here is a list of the various process statuses and what they mean:

D – Uninterruptible sleep (usually a critical system process, a process that cannot be killed without rebooting)
R – Running
S – Interruptible sleep (waiting for an event to complete)
T – Stopped
Z – Defunct (“zombie”) process

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connect to AWS

It is possible to use password to connect to AWS

1) change config file
sudo vi /etc/ssh/sshd_config

PermitRootLogin yes
PasswordAuthentication yes

2) restart
sudo service ssh restart

3) add a password
sudo passwd root

4) ssh without key
ssh root@xxx.com

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