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• Postfix smtp test occured "Relay access denied"

  - by liuxingruo

  I was following the tutorial http://wiki.centos.org/zh/HowTos/postfix_restrictions but, when I tried to send a mail with smtp, it returns: Connected to XXX.XXX.33.22 (XXX.XXX.33.22). Escape character is '^]'. 220 mail.xxxx.com ESMTP Postfix HELO mail.xxxx.com 250 mail.xxxx.com MAIL FROM:<[email protected]> 250 2.1.0 Ok RCPT TO:<[email protected]> 554 5.7.1 <[email protected]>: Relay access denied And, the postfix main.cf setting is relay_domains =

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• Linux weird problem touch : command not found ?

  - by liuxingruo

  Hey guys, I occurred a really weired problem, which is touch : command not found. I was going to create a blank file, so I type the touch command which didn't work. I'm running centOS 5. Any ideas? BTW: the vi command also not found.

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• Linux weird problem touch : command not found ?

  - by liuxingruo

  Hey guys, I occurred a really weired problem, which is touch : command not found. I was going to create a blank file, so I type the touch command which didn't work. I'm running centOS 5. Any ideas? BTW: the vi command also not found.

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• why my server has a dir named "?"

  - by liuxingruo

  These are all the dirs in my server: ? bin boot dev etc home lib lost+found media media2 misc mnt net opt proc root sbin selinux srv sys tmp usr var why there is a "?" dir? Thanks very much. BTW: the touch command was found on my server(wiered). I list the bin dir: alsacard cp dd env hostname loadkeys more ps sed tcptraceroute alsaunmute cpio df ex igawk loadkeys.static mount pwd setfont traceroute6 arch csh dmesg false ipcalc logger mountpoint raw setserial tracert awk cut dnsdomainname fgrep kbd_mode login mv red sh view basename date doexec gawk keyctl ls netstat redhat_lsb_init sleep ypdomainname bash dbus-cleanup-sockets domainname gettext kill mail nice rm sort cat dbus-daemon dumpkeys grep ksh mailx nisdomainname rmdir stty chgrp dbus-monitor echo gtar ksh93 mkdir pgawk rpm su chmod dbus-send ed gunzip link mknod ping rvi sync chown dbus-uuidgen egrep gzip ln mktemp ping6 rview tar touch is missing, how can i get it back?

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• How to backup mysql daily and backup binary log hourly on linux?

  - by liuxingruo

  Hey guys, I'm wondering how can I backup mysql daily and backup binary log hourly? I don't know how to write a script to do this(or use etc/crontab?).

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• How to implement a simple mail server using postfix and dovecot?

  - by liuxingruo

  I have followed the tutorial(exactly) http://wiki.centos.org/HowTos/postfix but I can't telnet my server's 25 port, I have no idea about this issue, so why? Thanks

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• How to reinstall 'touch(command)' in Linux?

  - by liuxingruo

  I can't find touch command in '/bin' and 'usr/bin'. When I use touch command, the server tells me touch command not found. So, I'm wondering How can I reinstall the missing touch command?

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• Linux usleep: command not found, Why?

  - by liuxingruo

  When I was tring to restart dovecot service, it returns: Stopping Dovecot Imap: /etc/init.d/functions: line 274: usleep: command not found

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• How to open port 25 on the server

  - by liuxingruo

  I'm using centOS. I want to implement a smtp mail server, and I have installed postfix and dovecot(both have been set correctly). I tried to telnet the 25 port, but it returns Unable to connect to remote host: Connection refused So, How can I open the 25 port? Thanks!

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• How to list all users and groups on linux?

  - by liuxingruo

  How to list all users and groups on linux? And what's the difference between user:root user:othergroup? Thanks!

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• how to fetch app data(name, version, etc.) from android market?

  - by liuxingruo

  As we know, the apps in the apple app store has a unique itunes link, and we can fetch app data about the app from app store through the link. I am wondering how can i achieve this in the android market, just like the website http://www.androlib.com/ did? As long as I know, each app in the android market has a ID, which just like "com.gabrouze.magic", and the QR Code can be viewed in "http://chart.apis.google.com/chart?cht=qr&chs=135x135&chl=market://search?q=pname:com.gabrouze.magic". Thanks!

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• Linux weird problem touch : command not found ?

  - by liuxingruo

  Hey guys, I occurred a really weired problem, which is touch : command not found. I was going to create a blank file, so I type the touch command which didn't work. I'm running centOS 5. Any ideas? BTW: the vi command also not found.

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• How to design tag database structure?

  - by liuxingruo

  I have a subjects database, and I want to create a new tag database to tag the subjects, but I have no idea how to design the new tag database structure. I'm assuming the new database looks like this: tag_id tag_name tagged_subject_ids 1 tag1 1, 2, 3, 5, 10 2 tag2 2, 4, 5, 6, 10, 12 so, if I want to select the tags belong to subject 1: SELECT tag_name FROM tag_database WHERE tagged_subject_ids LIKE '1'; I think the way that I select tag may be very slow, so please help me. Thanks!

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• How to only select numeric data from mysql?

  - by liuxingruo

  Does mysql have a funcion like is_num() which can allow me determine the data is numeric or not? Thanks.

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• How can I select columns with specific collation from mysql?

  - by liuxingruo

  Hey guys, I wondering how can I select columns with specific collation. For example, I want to select all the columns which their collation is utf-8. How can I get these things done? Thanks very much!

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• How to create a table in a particular database?

  - by liuxingruo

  The create database statement is: CREATE TABLE table_name ( column_name1 data_type, column_name2 data_type, column_name3 data_type, .... ) but, I'm wondering how can I create a table in a specific database? thanks, guys!

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• How to format a dateline using php?

  - by liuxingruo

  I'm wondering how to make the datelines looks like the same. e.g 2007-7, 200707 = 2007-07 Thanks!

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• Mysql database not responded(crash?) when UPDATE , DROP/ALTER tables

  - by liuxingruo

  When I try to update a value in a column or DROP a table or ALTER a table, the database just not respond, and I have to reboot the service to get database works again. I can only SELECT data from my database(SO SAD).... Please help me, THANKS!!!!!!!!!!!!!!!!!

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• IE6 javascript can't get height by document.getElementById(id).offsetHeight

  - by liuxingruo

  Hey guys, I just got a problem which is I can't get the height property of a <p>.(use javascript document.getElementById(id).offsetHeight) It works fine both in FF or chrome. I have tried to set the style of the <p> to height:100%;/height:auto; but both not work. Please help me, thanks :D

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• How can I use php to parse a date string?

  - by liuxingruo

  the date stringe is Apr 30, 2010 I want to parse the string into 2010-04-30 using php, how can I achieve this? Thanks!!

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