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.

shell script to backup files and directories in Linux using tar & cron jobs

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The vi Editor http://t4test.com/blog/unix-linux-shell-script-introduction-to-shell-scripting/ http://t4test.com/blog/read-making-shell-script-interactive/ http://t4test.com/blog/cpio-a-backup-program/ Backup Using TAR Backing up your files using tar is very simple you just type a little command. tar -cvpzf /BackupDirectory/backupfilename.tar.gz /ImportantData/directory/path Let’s suppose i have directory called /imp-data on root and i want to make backup of this directory including sub directories on different location like in /mybackupfolder. … Read more

shell script to get yesterday’s date into a variable

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a shell script which does the following to store the current day’s date in a variable ‘dt’: date “+%a %d/%m/%Y” | read dt echo ${dt} How would i go about getting yesterdays date into a variable?

Find out Gateway / router IP address under Linux / UNIX using route command

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You need to use route command. This command can manipulates the kernel’s IP routing tables. It can be also use to print gateway / router IP address. Type the following command to see default gateway: $ route -n Output: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.0.10.54 0.0.0.0 255.255.255.0 U … Read more

Shell script to show calender

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Use your vi  editor to create shell script, script.sh . This script runs three echo commands and shows the use of variable evaluation and command substitution. It also prints the calender of the current month. #!/bin/sh echo “Today’s date : `date` ” echo “This month’s calender:” cal `date “+%m 20%y` echo “My shell : $SHELL” … Read more

VI editor – Linux command line editor

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http://blog.eduguru.in/linux-2/the-vi-editor http://t4test.com/blog/unix-linux-shell-script-introduction-to-shell-scripting/ http://t4test.com/blog/cpio-a-backup-program/ http://t4test.com/blog/read-making-shell-script-interactive/ http://t4test.com/blog/root-system-administrator-super-user-part-1/ http://t4test.com/blog/etchosts-the-host-file/ VI editor  VI operates in three modes for performing different functions. —-The Command Mode is used to enter commands that operates on text or control cursor motion. —-The Input Mode is used to enter text. —-The ex Mode (or last line mode) is used for line handling and substitution. … Read more

Find Linux RAM Information Command and system information

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  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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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