Tag Archives: linux tutorials

Linux Iptables Delete postrouting Rule Command

Linux Iptables Delete postrouting Rule Command

I am a new Linux server sysadmin. I need to delete POSTROUTING rule. How do I delete postrouting rule on Linux server?
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10 Ubuntu / Debian Linux apt Command Examples

10 Ubuntu / Debian Linux apt Command Examples
I am a new Linux system admin user. How do I use apt command line utility for the package management on Ubuntu Linux LTS and Debian Linux server? How can I use the apt command for the package management? APT stands for Advanced Package Tool. It is a set of core tools inside Debian and […]
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Book Review: FreeBSD Mastery: Specialty Filesystem

Book Review: FreeBSD Mastery: Specialty Filesystem
FreeBSD Mastery: Specialty FilesystemsA filesystem is nothing but the data structures that an operating system uses to keep track of files on a disk. The filesystem stores your pictures, music, videos, accounting data and more. The different operating system comes with various filesystems. You may need to move data between FreeBSD and other Unix-like systems like OS X or Linux based device. Knowing all about filesystem help us to archive or move data between system. The “FreeBSD Mastery: Specialty Filesystem” is an essential, practical and well-written book.
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How to gzip and keep original file on Unix or Linux command line

How to gzip and keep original file on Unix or Linux command line

I would like to compress a log file using gzip Unix command line utility, and I would also like to keep the original file. However, when I use the gzip my-app.log command, results in modifying my log file and renaming it my-app.log.gz. How do I force the gzip command to keep original file while maintaining the original file on Linux or Unix-like system?
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Unix / Linux: Remove duplicate lines from a text file using awk or perl

Unix / Linux: Remove duplicate lines from a text file using awk or perl
I have a text file with exact duplicates of lines. I need to remove all those duplicates lines and preserves the order too on Linux or Unix-like system. How do I delete duplicate lines from a text file? You can use Perl or awk or Python to delete all duplicate lines from a text file […]
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Linux: lxc forcefully stop and kill container

Linux: lxc forcefully stop and kill container
I want to stop the application running inside a container. I issued lxc-stop -n myapp but the command is not returning to the shell prompt, and my lxc container entered in hang state. How do I kill my container running on Ubuntu Linux host?
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How to check Debian/Ubuntu Linux package version using apt-get/aptitude command

How to check Debian/Ubuntu Linux package version using apt-get/aptitude command

I am a new Debian / Ubuntu Linux sysadmin. I would like to find out what version I would install if I ran the apt-get command. How do I find out which versions of a package can I install using apt-cache/apt-get command? How do you check package version using apt-get/aptitude on Debian or Ubuntu Linux server?
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