linux

Linux is an open-source operating system (OS). An operating system is software that directly manages a system’s hardware and resources, like CPU, memory, and storage. The OS sits between applications and hardware and makes the connections between all of your software and the physical resources that do the work. Here, at https://blog.eduguru.in, We will discuss and solve real-life problems coming on Linux OS. We also know more interesting features of Linux here.

Find Linux RAM Information Command and system information

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Linux yum

  You need to use the free command: # free # free -m total used free shared buffers cached Mem: 7930 4103 3826 0 59 2060 -/+ buffers/cache: 1983 5946 Swap: 15487 0 15487 For system information: You need to use the dmidecode command: # dmidecode –type 17 OR # dmidecode –type memory OR # … Read more

Mount.cifs cannot allocate memory mounting

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Linux yum

Mounting a Windows (SMB) share on Ubuntu gives us a “cannot allocate memory” error. Executing a command like this: mount -t cifs //toad/Backup /media/backup -o user=username,password=password,iocharset=utf8,file_mode=0777,dir_mode=0777 We get an error like this: mount error(12): Cannot allocate memory Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) Solution: First, check the permissions on your shared folder. … Read more

Startup: Unable to load dynamic library ‘/usr/lib/php/modules/module.so’

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this error come up while running a shell script to get the parameter from php file PHP Warning: PHP Startup: Unable to load dynamic library ‘/usr/lib/php/modules/module.so’ – /usr/lib/php/modules/module.so: cannot open shared object file: No such file or directory in Unknown on line 0  This is cause by mcrypt extension. Edit /etc/php.d/mcrypt.ini and change ; Enable … Read more

SQL FOREIGN KEY Constraint

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CREATE TABLE product ( category INT NOT NULL, id INT NOT NULL, price DECIMAL, PRIMARY KEY(category, id) ) ENGINE=INNODB; CREATE TABLE customer ( id INT NOT NULL, PRIMARY KEY (id) ) ENGINE=INNODB; CREATE TABLE product_order ( no INT NOT NULL AUTO_INCREMENT, product_category INT NOT NULL, product_id INT NOT NULL, customer_id INT NOT NULL, PRIMARY KEY(no), … Read more

Creating a table with auto_increment

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CREATE TABLE example_autoincrement ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, data VARCHAR(100) ); CREATE TABLE example_innodb ( id INT, data VARCHAR(100) ) TYPE=innodb;

copy a folder under linux server to windows server

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MS-Windows shared folder: You can share data between windows and linux system for such use : For example you would like to access MS-Windows share called //windowsserver/sharename by mounting to /mnt/win directory under Linux system. So execute these commands: mkdir -p /mnt/win mount -t smbfs -o username=winntuser,password=mypassword //windowsserver/sharename /mnt/win Next create the password file /etc/sambapasswords: … Read more