The df utility displays the disk space usage on all mounted filesystem.
The -T option prints the filesystem type as well. By default, df measures the size in 1K blocks, which could be a little difficult for a desktop user to decipher. Use the -h option to get the more understandable output:
It is a simple task and a very common task for a VPS user. You have a VPS, and want to know the disk usage of your data and system. You are also want to know which folder takes the biggest disk space.
The command is du
du takes a single argument, specifying a pathname for du to work; if it is not specified, the current directory is used. The SUS mandates for du the following options:
-a, display an entry for each file (and not directory) contained in the current directory
-c, display a grand total of the disk usage found by the other arguments
-d #, the depth at which summing should occur. -d 0 sums at the current level, -d 1 sums at the subdirectory, -d 2 at sub-subdirectories, etc.
-H, calculate disk usage for link references specified on the command line
-k, show sizes as multiples of 1024 bytes, not 512-byte
-L, calculate disk usage for link references anywhere
-s, report only the sum of the usage in the current directory, not for each file
-x, only traverse files and directories on the device on which the pathname argument is specified.
Above command usage method retrieved from Wikipedia.
But I got error which said bc is not found. So just enter following yum install bc to install it.
[root@vps test]# ./tuning-primer.sh
which: no bc in (/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)
Error: Command line calculator 'bc' not found!
[root@vps test]# yum install bc
The task is to delete files from the folder and sub-folders, maybe sub-sub-folder.
Say I want to delete .htaccess from every folder, but keep all others no-touch.
It is hard to go into each folder and delete the file. It takes time and also very easy to miss some folders.
There is one command in Linux. Great tool for it.
One line to do the job.
I have a batch file, to run the command and want to close it automatically.
But it is always prompt that ask for Confirmation.
Actually I just want it run by schedule and close itself after finishing.
So, I use the Google BB (Big Buddha) to search it.
The final answer and only one answer is below.
Some times you need to find out what version is your Linux OS. Just like when I need to download a module, I have to find out which one is right for my OS. Then I can download 32bit, or 64bit package.
The most common way to find your Linux installation is enter the following shell command.
To transfer the the large mySQL database, you need to learn how to use command to do it.
Large, means the database is bigger than 8 MB after compressing.
phpmyadmin, is a wonderful web tool for mySQL. But the limitation of upload is 8 MB. If the backup file is larger than it, you can not upload it, of course can not import it.
The platform I am working is Linux, Centos. It is ssh command environment.
1) Backup, export all tables of one database into one file.
I use this command to backup my forum database. The result is gzip file, means after compressing. I have a database is above 500MB. The gz file is about 125MB.
When I have the gz file, I can download it to my PC, or put it on other server for transferring.