You need find these records, which can cause this issue and remove it:
SELECT * FROM papurl_alias group by keyword having count(*) >= 2;
DELETE FROM papurl_alias where 497673="397570";
cat some_file| paste -sd "," -
example:
tail -5 /etc/passwd | cut -d":" -f3 | paste -sd "," -
mysqld --verbose --help | grep -A 1 "Default options"
last -Fd
This is useful before server restart, if you have changed HDD some time ago.
dd bs=512 count=1 if=/dev/sda 2>/dev/null| strings
or
file -s /dev/sda
find -type f -executable -exec file -i '{}' \; | grep 'x-executable; charset=binary'
sudo shutdown -P +60
If you forgot run process on screen, you can move procesas on it:
yum install reptyr
screen
reptyr $(pgrep name_of_proccess)
vim /etc/postfix/main.cf
mailbox_size_limit = 0
service postfix restart
This means your HDD missing boot loader and you should try boot from another hdd id you have software raid device.
yum remove iputils
yum install ftp://bo.mirror.garr.it/1/slc/centos/7.2.1511/os/x86_64/Packages/iputils-20121221-7.el7.x86_64.rpm
vi /etc/yum.conf
exclude=iputils
modprobe ploop
modprobe pfmt_ploop1
modprobe pfmt_raw
modprobe pio_direct
Just double quotation marks: "
nmap --script ssl-enum-ciphers -p 443 www.linuxls.com