Learning RHEL Networking

Posted on Posted in Networking & System Administration

Format: Paperback

Language: English

Format: PDF / Kindle / ePub

Size: 11.70 MB

Downloadable formats: PDF

On the Linux/Unix side, Tarantella supports the display of Unix server applications on non-Unix, non-Linux machines. An A-Z Index of the Bash command line for Linux. alias Create an alias • apropos Search Help manual pages (man -k) apt-get Search for and install software packages (Debian/Ubuntu) aptitude Search for and install software packages (Debian/Ubuntu) aspell Spell Checker awk Find and Replace text, database sort/validate/index b basename Strip directory and suffix from filenames bash GNU Bourne-Again SHell bc Arbitrary precision calculator language bg Send to background bind Set or display readline key and function bindings • break Exit from a loop • builtin Run a shell builtin bzip2 Compress or decompress named file(s) c cal Display a calendar case Conditionally perform a command cat Concatenate and print (display) the content of files cd Change Directory cfdisk Partition table manipulator for Linux chgrp Change group ownership chmod Change access permissions chown Change file owner and group chroot Run a command with a different root directory chkconfig System services (runlevel) cksum Print CRC checksum and byte counts clear Clear terminal screen cmp Compare two files comm Compare two sorted files line by line command Run a command - ignoring shell functions • continue Resume the next iteration of a loop • cp Copy one or more files to another location cron Daemon to execute scheduled commands crontab Schedule a command to run at a later time csplit Split a file into context-determined pieces curl Transfer data from or to a server cut Divide a file into several parts d date Display or change the date & time dc Desk Calculator dd Convert and copy a file, write disk headers, boot records ddrescue Data recovery tool declare Declare variables and give them attributes • df Display free disk space diff Display the differences between two files diff3 Show differences among three files dig DNS lookup dir Briefly list directory contents dircolors Colour setup for `ls' dirname Convert a full pathname to just a path dirs Display list of remembered directories dmesg Print kernel & driver messages du Estimate file space usage e echo Display message on screen • egrep Search file(s) for lines that match an extended expression eject Eject removable media enable Enable and disable builtin shell commands • env Environment variables ethtool Ethernet card settings eval Evaluate several commands/arguments exec Execute a command exit Exit the shell expect Automate arbitrary applications accessed over a terminal expand Convert tabs to spaces export Set an environment variable expr Evaluate expressions f false Do nothing, unsuccessfully fdformat Low-level format a floppy disk fdisk Partition table manipulator for Linux fg Send job to foreground fgrep Search file(s) for lines that match a fixed string file Determine file type find Search for files that meet a desired criteria fmt Reformat paragraph text fold Wrap text to fit a specified width. for Expand words, and execute commands format Format disks or tapes free Display memory usage fsck File system consistency check and repair ftp File Transfer Protocol function Define Function Macros fuser Identify/kill the process that is accessing a file g gawk Find and Replace text within file(s) getopts Parse positional parameters grep Search file(s) for lines that match a given pattern groupadd Add a user security group groupdel Delete a group groupmod Modify a group groups Print group names a user is in gzip Compress or decompress named file(s) h hash Remember the full pathname of a name argument head Output the first part of file(s) help Display help for a built-in command • history Command History hostname Print or set system name htop Interactive process viewer i iconv Convert the character set of a file id Print user and group id's if Conditionally perform a command ifconfig Configure a network interface ifdown Stop a network interface ifup Start a network interface up import Capture an X server screen and save the image to file install Copy files and set attributes ip Routing, devices and tunnels j jobs List active jobs • join Join lines on a common field k kill Kill a process by specifying its PID killall Kill processes by name l less Display output one screen at a time let Perform arithmetic on shell variables • link Create a link to a file ln Create a symbolic link to a file local Create variables • locate Find files logname Print current login name logout Exit a login shell • look Display lines beginning with a given string lpc Line printer control program lpr Off line print lprint Print a file lprintd Abort a print job lprintq List the print queue lprm Remove jobs from the print queue lsblk List block devices ls List information about file(s) lsof List open files m make Recompile a group of programs man Help manual mkdir Create new folder(s) mkfifo Make FIFOs (named pipes) mkisofs Create an hybrid ISO9660/JOLIET/HFS filesystem mknod Make block or character special files more Display output one screen at a time most Browse or page through a text file mount Mount a file system mtools Manipulate MS-DOS files mtr Network diagnostics (traceroute/ping) mv Move or rename files or directories mmv Mass Move and rename (files) n nc Netcat, read and write data across networks netstat Networking information nice Set the priority of a command or job nl Number lines and write files nohup Run a command immune to hangups notify-send Send desktop notifications nslookup Query Internet name servers interactively o open Open a file in its default application op Operator access p passwd Modify a user password paste Merge lines of files pathchk Check file name portability ping Test a network connection pgrep List processes by name pkill Kill processes by name popd Restore the previous value of the current directory pr Prepare files for printing printcap Printer capability database printenv Print environment variables printf Format and print data • ps Process status pushd Save and then change the current directory pv Monitor the progress of data through a pipe pwd Print Working Directory q quota Display disk usage and limits quotacheck Scan a file system for disk usage r ram ram disk device rar Archive files with compression rcp Copy files between two machines read Read a line from standard input • readarray Read from stdin into an array variable • readonly Mark variables/functions as readonly reboot Reboot the system rename Rename files renice Alter priority of running processes remsync Synchronize remote files via email return Exit a shell function rev Reverse lines of a file rm Remove files rmdir Remove folder(s) rsync Remote file copy (Synchronize file trees) s screen Multiplex terminal, run remote shells via ssh scp Secure copy (remote file copy) sdiff Merge two files interactively sed Stream Editor select Accept keyboard input seq Print numeric sequences set Manipulate shell variables and functions sftp Secure File Transfer Program shift Shift positional parameters shopt Shell Options shutdown Shutdown or restart linux sleep Delay for a specified time slocate Find files sort Sort text files source Run commands from a file '.' split Split a file into fixed-size pieces ss Socket Statistics ssh Secure Shell client (remote login program) stat Display file or file system status strace Trace system calls and signals su Substitute user identity sudo Execute a command as another user sum Print a checksum for a file suspend Suspend execution of this shell • sync Synchronize data on disk with memory t tail Output the last part of file tar Store, list or extract files in an archive tee Redirect output to multiple files test Evaluate a conditional expression time Measure Program running time timeout Run a command with a time limit times User and system times touch Change file timestamps top List processes running on the system tput Set terminal-dependent capabilities, color, position traceroute Trace Route to Host trap Run a command when a signal is set(bourne) tr Translate, squeeze, and/or delete characters true Do nothing, successfully tsort Topological sort tty Print filename of terminal on stdin type Describe a command • u ulimit Limit user resources • umask Users file creation mask umount Unmount a device unalias Remove an alias • uname Print system information unexpand Convert spaces to tabs uniq Uniquify files units Convert units from one scale to another unrar Extract files from a rar archive unset Remove variable or function names unshar Unpack shell archive scripts until Execute commands (until error) uptime Show uptime useradd Create new user account userdel Delete a user account usermod Modify user account users List users currently logged in uuencode Encode a binary file uudecode Decode a file created by uuencode v v Verbosely list directory contents (`ls -l -b') vdir Verbosely list directory contents (`ls -l -b') vi Text Editor vmstat Report virtual memory statistics w wait Wait for a process to complete • watch Execute/display a program periodically wc Print byte, word, and line counts whereis Search the user's $path, man pages and source files for a program which Search the user's $path for a program file while Execute commands who Print all usernames currently logged in whoami Print the current user id and name (`id -un') wget Retrieve web pages or files via HTTP, HTTPS or FTP write Send a message to another user x xargs Execute utility, passing constructed argument list(s) xdg-open Open a file or URL in the user's preferred application. xz Compress or decompress .xz and .lzma files yes Print a string until interrupted zip Package and compress (archive) files..

Linux Networking Clearly Explained

Posted on Posted in Networking & System Administration

Format: Print Length

Language: English

Format: PDF / Kindle / ePub

Size: 10.91 MB

Downloadable formats: PDF

In order to make our discussion more concrete, let's introduce an imaginary network, made up of the machines eggplant, papaya, apricot, and zucchini. Most of these problems result from one of three situations: N Testing Red Hat Linux for compatibility with every piece of hardware is simply not possible. If anyone having reference, please call to my number +91-88920-35529. or you can reply to my email id ashishrao8021@gmail.com. Elm leads you through the process of creating a new alias by asking for the person’s first and last name, e-mail address, and, finally, what you want the alias to be. 4.

FreeBSD Mastery: ZFS (IT Mastery Book 7)

Posted on Posted in Networking & System Administration

Format: Print Length

Language: English

Format: PDF / Kindle / ePub

Size: 5.03 MB

Downloadable formats: PDF

Highlight the Quit button, and press Enter again to exit the Text Mode Setup Utility. The bootcamp is a fast paced course and assumes basic understanding of computers. The second if statement makes sure that the argument passed to filetest.sh (the $1 parameter) is a directory name. This dialog box has three tabs labeled General, Retrieval/Installation, and Package Exceptions. For the purpose of this article, I will be downloading and installing patch: 5337014.

Linux Administration: A Beginners Guide, Sixth Edition 6th

Posted on Posted in Networking & System Administration

Format: Paperback

Language:

Format: PDF / Kindle / ePub

Size: 11.93 MB

Downloadable formats: PDF

Listing 5-4 is an excerpt that demonstrates the syntax and logic of the syslog.conf file. You use these ports when attaching a modem to the system to establish a PPP or UUCP connection. Usage: transfer-format “one-answer many-answers”; (choose one). Its syntax is the simplest of all the user account administration commands you have seen so far: userdel [-r] username username indicates the user account to delete. For Linux, it will be ethX, where 'X' is a number. (default eth0): Do you want the link to come up on demand, or stay up continuously?

Instant Chef Starter

Posted on Posted in Networking & System Administration

Format: Print Length

Language: English

Format: PDF / Kindle / ePub

Size: 14.45 MB

Downloadable formats: PDF

FORMATTING QUERY OUTPUT Inveterate tweakers and hard-core customizers appreciate the --qf option because it allows custom formatting of query output. N How much fuel for the generator have you planned on? Close the FTP session: ftp> bye After you have the archive file, verify the file’s integrity and unpack it as described in the next section. Look at the file /etc/passwd on the file server which you will mount to determine the user ID number and group ID number. Two name servers are listed in the file shown in Figure 12-2.

sendmail for Linux

Posted on Posted in Networking & System Administration

Format: Paperback

Language: English

Format: PDF / Kindle / ePub

Size: 9.93 MB

Downloadable formats: PDF

You can however, use the ifconfig command at the shell prompt or Ubuntu's graphical network configuration tools, such as network-admin, to edit your system's network device information or to add or remove network devices on your system If you are new to networking the graphical configuration tool is your best method for configuring new hardware in Ubuntu. The transmission can be any size because it is broken down into small pieces as you have already seen. Configuration of the Host takes 4 steps: The good news, Linux containers are part of the mainstream Linux kernel.

CentOS 7 Linux Server Cookbook - Second Edition

Posted on Posted in Networking & System Administration

Format: Paperback

Language: English

Format: PDF / Kindle / ePub

Size: 12.87 MB

Downloadable formats: PDF

Use the Service Configuration tool, as explained earlier, to configure ypbind to start at boot time. 9. Using the Internet and its Predecessor Networks (ArpaNET, UseNET, BitNET, FidoNET, BBS, others). The main or default server serves only requests sent to localhost (127.0.0.1) because requests to all other IP addresses about which Apache knows are served by the www.domain.com except those specifically sent to www.that.domain.com. The netstat command is used to display the TCP/IP network protocol statistics and information.

Linux and Solaris Recipes for Oracle DBAs

Posted on Posted in Networking & System Administration

Format: Paperback

Language: English

Format: PDF / Kindle / ePub

Size: 9.94 MB

Downloadable formats: PDF

Permission to mount exported file systems can be limited to a single host or to a group of hosts using either host names with the wildcards * and? or using IP address ranges. The second line shows memory usage adjusted for buffering. System and user files can have different relative priority depending on the situation. Place of residence plays a huge part in a Linux System Administrator's salary, with Chicago Linux System Administrators earning salaries that are 25 percent less than the national average.

SUSE Linux Enterprise Server Administration (Course 3112):

Posted on Posted in Networking & System Administration

Format: Paperback

Language: English

Format: PDF / Kindle / ePub

Size: 5.32 MB

Downloadable formats: PDF

To squeeze the best performance from your equipment, monitor your system carefully and use Linux’s built-in configurability wisely. 10 Part I: Red Hat Linux System and Network Administration Defined Configuring a Secure System If there is a common thread in Linux system administration, something that is a constant presence in everything you do, it is the security of the computer and data integrity. In Spain some regions have developed their own Linux distributions, which are widely used in education and official institutions, France and Germany have also taken steps toward the adoption of Linux.

OpenStack Cloud Computing Cookbook Second Edition

Posted on Posted in Networking & System Administration

Format: Print Length

Language: English

Format: PDF / Kindle / ePub

Size: 8.15 MB

Downloadable formats: PDF

Often a network or system administrator wants to quickly get a “look” at the actual network traffic on a given host. N These machines should have no ordinary user accounts, and as few administrative accounts as possible. Linux is most popular on Intel-based PCs (price of the hardware), but it runs very well on numerous other hardware platforms, from toy-like to mainframes. Use the anonuid and anongid options to specify the UID and GID of the anonymous user. I will be running these commands on linux1.