Background Job : A job which is running background in the same shell. You can use bg command to see any background jobs.
Foreground job : A Job which is running in the same shell right before your eyes.
Suspended Job : Its a stopped/pause job but you can resume their running.
Let me explain with example very clealy
virt00# sleep 180
^Z
zsh: suspended sleep 180
virt00# jobs
[1] + suspended ...
Deny SSH access to particular users
February 28, 2016
Raaz
allowgroups, allowusers, centos, debian, denygroups, denyusers, fedora, Linux, order, redhat, ssh, ubuntu
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Edit
We all know SSH is very famous and the best service for remote access.
Today I am going to tell you how to block or allow only particular users or group from SSH access.
open sshd_config file as per your environment
in Debian
vim /etc/ssh/sshd_config
Then add below line to enable access for only below users
AllowUsers username1 username2
to deny access for only below users add a line as
DenyUsers...
How to see IOWAIT in Linux
Hello ,
You can use sar command.
in Ubuntu you can install it with
sudo apt-get install systat
and enable data collecting
sed -i 's/ENABLED="false"/ENABLED="true"/' /etc/default/sysstat
start service with
/etc/init.d/sysstat start
To see I/O latency type command as
sar 1 1
that means it will give two responses with 1 sec as interval.
Example :
root@virt01:~# sar 1 3
Linux 3.19.0-42-generic...
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