with Andrej’s article I found some nice tips & tricks and the Vim manual for diff tasks. Some useful commands,
* “vim -o one.txt two.txt three.txt” (for horizontal split), “vim -O one.txt two.txt three.txt ” (for vertical split)
* go to the next diff point ” ]c “; go to previous diff point “ [c “
* merge to original “do“, merge from original “dp“.
Where text highlighted red will display text which doesn’t match from the files being compared.
You are running APF on your server, but sometimes you think “is APF running fine?”
This script sends you an email with APF satus.
Log in to your server as root
Create the script:
# nano apf1.sh
Put this on the file:
tail -200 /var/log/apf_log | mail -s “APF Status” email@example.com
Save and Exit
Make it executable:
# chmod 755 apfstatus.sh
Move it to “/etc/cron.daily” folder:
# mv apf1.sh /etc/cron.daily
You will receive now a daily email with APF status.
top can be run non-interactively, in batch mode. Time delay and the number of iterations can be configured, giving you the ability to dictate the data collection as you see fit.
Here’s an example:
top -b -d 10 -n 3 >> top-file
We have top running in batch mode (-b). It’s going to refresh every 10 seconds, as specified by the delay (-d) flag, for a total count of 3 iterations (-n). The output will be sent to a file.
Change to the user you want to, then open the crontab editor:
# crontab -e
you can use this variables:
a = the minute after the hour that you want it done
b = the hour you want it done
c = Day of the Month
d = Month of the Year
e = Day of the week
f = ‘command you want to execute’
* = ALL
10 0 * * * /usr/local/aplication
It will run the application every day at 12:10 AM.
* * * – means all day of the month, all month of the year, all day of the week
Other crontab commands:
crontab -e opens the editor
crontab -l lists the contents of the crontab
crontab -r removes the crontab
I you are reading this, probably you are getting the next error:
/usr/local/bin/mysqladmin: connect to server at ‘localhost’ failed
error: ‘Can’t connect to local MySQL server through socket ‘/tmp/mysql.sock’ (2)’
Check that mysqld is running and that the socket: ‘/tmp/mysql.sock’ exists
To fix it, and if you are running cPanel just try to run the next commands:
# ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
# /scripts/mysqlup –force
If you get the next problem on rvsitebuilder running on a cpanel server:
The server was not able to find the document
Please check the url and try again. You might also want to report this
error to your webhost.
It should fix the problem to you:
Log in as root on your cpanel server and run these commands:
# rm -f /var/cpanel/rvglobalsoft/rvsitebuilder/var/INSTALL_COMPLETE.php
# rm -f /var/cpanel/rvglobalsoft/rvsitebuilder/rvsitebuilderversion.txt
# perl /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/autoinstaller.cgi
Open your WHM on a web browser, https://serverip:2087
And go to root WHM -> Plugins -> RVSiteBuilder
It will automatically rebuild the database for you and should fix the problem.
If you need to change all cpanel account themes, you can use this command as root:
# replace RS=oldtheme RS=newtheme — /var/cpanel/users/*
This will change all the cpanel users theme, if you need to change only one account,
# cd /var/cpanel/users/
# nano user_account
and replace rhe “RS=” line
Sometimes you just login in into a box using ssh and need to check the OS version.
If this box runs CentOS you can use this command to determine what is the CentOS version:
[root@box ~]# cat /etc/*release*
CentOS release 4.3 (Final)
You can backup a single cPanel account trough ssh using pkgacct cPanel script located at /scripts folder on your server. This tip is helpful for WebHosting companies that uses cPanel as Hosting control Panel
– Login to your cPanel server as root.
To backup a sigle account use the next commands:
# cd /scripts
# ./pkgacct username
These commands will crate a file named “cpmove-username.tar.gz” on /home directory. And this is the file you need to restore on this server latter or on other server.
How to restore cPanel sigle account on other server
You just need to upload “cpmove-username.tar.gz” to the server you want to restore it or you can do it in the first server if you want. To upload you can use ftp, rsync or scp.
– “cpmove-username.tar.gz” should be on /home directory
Run the next command:
# /scripts/restorepkg username
It will restore homedir, dbs, mail, all the old cPanel account.
When GRUB loads up, select the Red Hat Linux entry on the GRUB menu and then press “e” to edit the boot configuration.
Locate a line like this:
kernel /boot/vmlinuz-x.x.xx-x.xxx root=LABEL=/hdc
– type the number ‘1’ at the end.
Doing so boots the computer into run level 1- single user mode you will automatically be logged in as root.
Type ‘passwd’ at the prompt, now you can enter a new password here.