رکورد RP در DNS چیست؟

Error: Postfix - do not list domain example.com in BOTH mydestination and virtual_mailbox_domains

In my case, at least, removing mydomain.com from mydestination cleared things up. On my server, mydestination is just localhost, localhost.localdomain

GREAT SOLUTION, works for me.

Inspecting Postfix’s email queue.

1-  Display a list of queued mail

mailq

or

postqueue -p

To save the output to a text file you can run

mailq > myfile.txt

or

postqueue -p > myfile.txt

How to clean log file?

> logfile

or

cat /dev/null > logfile

دستورات کاربردی لینوکس

wc	wc, or "word count," prints a count of newlines, words, and bytes for each input file.

Change The Color of My Shell Prompt Under Linux or UNIX Permanently

$ cd
$ vi .bash_profile

OR
$ vi $HOME/.bashrc
Append the following line:
export PS1="\e[0;31m[\u@\h \W]\$ \e[m"
Save and close the file.

To do this changing you must logout an login again.

A list of color codes

Color	Code
Black	0;30
Blue	0;34
Green	0;32
Cyan	0;36
Red	0;31
Purple	0;35
Brown	0;33
Blue	0;34
Green	0;32
Cyan	0;36
Red	0;31
Purple	0;35
Brown	0;33

Note: You need to replace digit 0 with 1 to get light color version.

----------------------------- In Ubuntu 14.4 --------------------------

Run the following command in a terminal:

gedit ~/.bashrc

When .bashrc opens, locate and uncomment force_color_prompt=yes (that is, remove the hash, so it no longer looks like: #force_color_prompt=yes).

Save the file, and open a new terminal window, and you should already see a change (the prompt should be Light Green, which is defined by 1;32). You can then change any colour value you like; eg: 0;35 = Purple.

To edit the colour values, locate the following section, and change the default values with some of the examples listed further down:

if [ "$color_prompt" = yes ]; then
    PS1=’${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;31m\]\w\[\033[00m\]\$ ‘
else
    PS1=’${debian_chroot:+($debian_chroot)}\u@\h:\w\$ ‘
fi

You can check out this Bash colour chart for a full range of colour values, but here are a few basic ones you can play around with (note that “Light” isn’t what you might think – it actually means “bold”): Black 0;30 – Dark Gray 1;30 – Blue 0;34 – Light Blue 1;34 – Green 0;32 – Light Green 1;32 – Cyan 0;36 – Light Cyan 1;36 – Red 0;31 – Light Red 1;31 – Purple 0;35 – Light Purple 1;35 – Brown 0;33 – Yellow 1;33 – Light Gray 0;37 – White 1;37

For example, here is the line that I use it:

PS1='${debian_chroot:+($debian_chroot)}\[\033[01;35m\]\u@\h\[\033[00m\]:\[\033[01;34m\] \w\[\033[01;37m\] > '

ایجاد Virtual Hosting در آپاچی

root@www:~# vi /etc/apache2/sites-available/virtual.host

# create a file for virtual.host

 <VirtualHost *:80>

    ServerName www.virtual.host

    ServerAdmin [e-mail]

    DocumentRoot /home/wheezy/public_html

    ErrorLog /var/log/apache2/virtual.host.error.log

    CustomLog /var/log/apache2/virtual.host.access.log combined

    LogLevel warn

</VirtualHost>

root@www:~# a2ensite virtual.host 

Enabling site virtual.host.

To activate the new configuration, you need to run:

  service apache2 reload

root@www:~# service apache2 reload

خطا در Apache Virtual Hosting

در زمان اضافه کردن یک virtual host در آپاچی ممکن است این خطا مشاهده شود.

خطای داده شده :

root@tsrv:~# a2ensite vh.postfixhelp.html

ERROR: Site vh.postfixhelp.html does not exist!

راه حل:

a2ensite is simply a perl script that only works with filenames ending .conf

Therefore, I have to rename my setting file for mysite.com to mysite.com.conf as might be achieved as follows:

mv /etc/apache2/sites-available/mysite.com /etc/apache2/sites-available/mysite.com.conf

Success

ثبت رایگان سایت در موتورهای جستجو

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