The 101 Most Important UNIX and Linux Commands

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Snort is based on libpcap. Users can input multiple sort keys. SSH SSH is a command interface for secure remote computer access and is used by network admins to remotely control servers. The tail command displays the last few lines of the file. This is particularly helpful for troubleshooting code because admins don't often need all the possible logs to determine code errors. TOP TOP is a set of protocols for networks that performs distributed information processing and displays the tasks on the system that take up the most memory.

It writes to a standard output, but it does not accept file names as arguments -- it only accepts input from standard input. If the domain does not work or is not available, admins can use traceroute to track the IP. The wget command works non-interactively in the background when a user is logged off.

It can create local versions of remote websites and recreate original site directories. Each input is separated by blanks. Think you know your Linux commands? Take this quiz. The given post is very useful, however, If you are facing an issue with Asus tablet then check the guide given here Fix asus tablet stuck at loading screen and quickly remove all the technical glitches. With help from the Azure PowerShell module, you can avoid login prompts and automate the authentication process when using A migration to Office will require the IT staff to adjust how it manages the collaboration platform, which can get IT administrators must be able to identify privileged accounts in Active Directory for a more secure enterprise; two methods can Shifting some workloads from VMware to Hyper-V to rely on multiple hypervisors takes time and effort, but the flexibility and When the concept of containers became stale, Docker brought containers back to the forefront by creating container management Nominate the top virtualization, cloud and end-user computing products for the Best of VMworld U.

Oracle Dyn cuts sales and marketing jobs as Oracle plans to end some Dyn services in The layoffs come amid other Oracle So you want to build a serverless application on Microsoft Azure? Explore the tools and features that support those apps and A range of public cloud misconceptions -- including those related to security and cost -- give enterprise adopters the wrong idea Jessica Lulka. Sign in for existing members. Step 2 of A alias The alias command is a way to run a command or a series of Unix commands using a shorter name than those that are usually associated with such commands.

D declare The declare command states variables, gives them attributes or modifies the properties of variables. E echo Use echo to repeat a string variable to standard output. F find The find command searches the directory tree to locate particular groups of files that meet specified conditions, including -name, -type, -exec, -size, -mtime and -user. G gawk See AWK. H history The history function shows all the commands used since the start of the current session. I ifconfig The iconfig command configures kernel-resident network interfaces at boot time.

K kill With kill signals , admins can send a specific signal to a process. L less The less command lets an admin scroll through configuration and error log files, displaying text files one screen at a time with backward or forward navigation available. N neat A Gnome GUI tool that allows admins to specify the information needed to set up a network card.

This was last published in September Load More View All Manage. Top 5 Linux performance commands for system administrators Steps to install Docker on Ubuntu Login Forgot your password? Forgot your password? No problem! Submit your e-mail address below. We'll send you an email containing your password. Your password has been sent to:.

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Please create a username to comment. Good and very useful for beginners and please update all commands like this. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. Upcoming SlideShare.

50 Most Frequently Used UNIX / Linux Commands (With Examples).pdf

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Embeds 0 No embeds. No notes for slide. This is not a comprehensive list by any means, but this should give you a jumpstart on some of the common Linux commands.

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Bookmark this article for your future reference. Did I miss any frequently used Linux commands? Leave a comment and let me know. This example converts the DOS file format to Unix file format using sed command. KB, MB etc. What else can be said about the good old pwd who has been printing the current directory name for ages. To connect to a remote server and download multiple files, do the following. Check the status of a service: service ssh status Check the status of all the services. While there are lot of arguments that could be passed to a ps command, following are some of the common ones.

To view current running processes. H option stands for process hierarchy. Typical free command output. The output is displayed in bytes. To sort top output by any column, Press O upper-case O , which will display all the possible columns that you can sort by as shown below. To displays only the processes that belong to a particular user use -u option.

The following will show only the top processes that belongs to oracle user. By default df -k displays output in bytes. First get the process id using ps -ef command, then use kill -9 to kill the running Linux process as shown below. You can also use killall, pkill, xkill to terminate a unix process. Print the filename and get confirmation before removing the file.

This also removes the example directory itself.

Following example prints the content of file1 followed by file2 to stdout. Give full access to user and group i. To change owner to oracle and group to db on a file. This will prompt for the old password followed by the new password. This will not prompt for current password of the user. Root user can disable password for a specific user. Once the password is If any of these directories exist already, it will not display any error. View all the interfaces along with status. Locate command uses the database created by updatedb.

The example below shows all files in the system that contains the word crontab in it. General commands 2. System calls 3.

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C library functions 4. File formats and conventions 6. Games and screensavers 7. Miscellaneous 8. To view section 5 of crontab man page, do the following. This is useful to view the log files, that keeps growing. Super user can switch to any other user without entering their password. In the following example, john can execute the ls command as raj username.

To connect to a remote mysql database. This will prompt for a password. The focus of this course is to help you understand system administration tools, which will help you to become an effective Linux system administrator.

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Get the Linux Sysadmin Course Now! If you enjoyed this article, you might also like.. Mommy, I found it! But I guess the commands like du, scp and init should be included. I will also like to add that -S with ls will sort on size and -f with rm will forcefully remove files. The commands like shutdown, yum, rpm, whereis and whatis can be excluded. Hope this article is a Deepavalli treat.

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Very Nice and Informative. Please prepare one more treat for Christmas and New year RO 6 Geoff November 8, at am Great list — thanks! I would add: nmap -sP nnn.. Similar functionality is available via pgrep as well. But this is a handy list, nonetheless. I suspect it will be showing up in a lot of Google searches. Thanks a lot! Possible additions: rsync nano in vi category sudo in su category Instead of writing a while loop to run a command repeatedly, use watch. It runs the command you specify every 2 seconds default interval.

Examples are awesome.