A common problem with computers is when you have a number of large files (such as audio/video clips) that you may want to get rid of. You can find the biggest files in the current directory with: ( only in current directory ) ls -lSrh (the r causes the large files to be listed at…
One of the defining features of Linux and other UNIX-like operating systems is that “everything is a file.” This is an oversimplification, but understanding what it means will help you understand how Linux works. Many things on Linux appear in your file system, but they aren’t actually files. They’re special files that represent hardware devices,…
Most of you are very familiar with ping command which is most commonly used to check any network device is alive or not. A very simple and useful command. And if we can add date/time stamp in it, it will be more helpful to generate a good statistics. It is very easy in Linux without…
Unix and windows file formats are different. Sometime a Unix file which edit in Windows put a special character at the end of each line i.e ^M (CTRL+M). It can make that file useless sometime. But no worry you can fix that with ease, just follow the procedure given below: Open the file in vim…
tcpdump is a command line network sniffer, used to capture network packets. When you have only command line terminal access of your system, this tool is very helpful to sniff network packets. It has so many options: you can see the packet dump in your terminal, you can also create a pcap file (to see the…
yum is a package management tool, used to install, uninstall or update the Linux (CentOS, RHEL, Fedora etc.) packages. You can use yum with root privilege only. To install a package: yum install packagename To update a package, if already install or to install a package: yum update packagename To reinstall a installed package: yum…
Open the /etc/rsyslog.conf file for syslog configuration in fedora Linux (some linux like CentOS has /etc/syslog.conf). It will show the something similar as given below: # Log all kernel messages to the console. # Logging much else clutters up the screen. #kern.* /dev/console # Log anything (except mail) of level info or higher. # Don’t…
1. First step is to create a special FIFO file using mkfifo command, where you want to see the packet capture using WireShark. This file will use to read & write simultaneously using WireShark & tcpdump. mkfifo /tmp/packet_capture 2. Second give the following ssh command on your terminal, to start the tcpdump on remote PC.…
Few interesting commands which can be used to send the messages on other terminal or network: 1. wall: This command is used to broadcast a message on all terminals. For e.g.: wall “Hello, message testing” or cat msg.txt | wall 2. write: This command is used to send message to a user & selected terminal…
Check & close the applications which are using any mounted partition or folder If you are using a separate partition for your applications, you need to mount that partition to a folder. Then only you can store & run the application. But if you want to umount that partition again, first you need to close…
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