unix™ and linux™ operating systems
lecture operating system chapter 10 case study; UNIX and Linux
Ngày tải lên :
18/10/2014, 15:30
... highly simplified shell Threads in POSIX The principal POSIX thread calls The ls Command Steps in executing the command ls type to the shell Flags for Linux clone Bits in the sharing_flags bitmap ... on a multilevel queue structure Booting UNIX cp The sequences of processes used to boot some systems Handling Memory Process A Process B • Process A's virtual address space • Physical memory • ... directories found in most UNIX systems The UNIX File System (2) • Before linking • After linking (a) Before linking (b) After linking The UNIX File System (3) • Separate file systems • After mounting...
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Tài liệu Unix and Linux Backups for System Administrators pptx
Ngày tải lên :
17/01/2014, 08:20
... file system; and dd offers the capability of a binary dump, tape-to-tape copying and file conversions We reviewed the use of the mt command and showed it in context with dump commands Lastly, ... network and be tested before a crisis hits 43 Appendix - cpio • Some systems not support dd; On those systems, cpio is used • cpio copies files to and from a cpio or tar archive Unix and Linux ... tar, dump, and dd Each command will be presented with usage, examples, and a description of the situation that each is best suited for We will also touch on some personal "war stories" and useful...
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Tài liệu Basic UNIX and Linux Auditing pptx
Ngày tải lên :
17/01/2014, 08:20
... an access control device and how to integrate it with syslog • Be able to find programs that run as root and look for hidden files • Verify and monitor network services and Internet connection ... the login line and is dutifully recorded in the btmp file If the file is world readable, anyone can come along and look for such entries They can then guess, using the who command and login times, ... activated and secured I this by following these simple steps: First, I check to see if wtmp and btmp were installed by default If not, then I create them using the touch command I use the ls command...
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Adaptive Narrative: How Autonomous Agents, Hollywood, and Multiprocessing Operating Systems Can Live Happily Ever After docx
Ngày tải lên :
16/03/2014, 17:20
... foreground and background narratives, in same way as the fg and bg console commands can swap UNIX foreground and background processes,3 a background narrative can always create an “interrupt,” demanding ... story of military arrogance; and, (e) a deteriorating situation at base command, where demands on men and equipment may mean a shortage of relief troops, ground vehicles, and helicopters On their ... actors, and scenarios were played out under the invisible control of a (human) wizard An agent command interface and two-way radios closed the behavior loop, giving the wizard control over agents and...
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UNIX and linux system administration handbook (4th edition)
Ngày tải lên :
19/03/2014, 13:36
... electronic versions and/ or custom covers and content particular to your business, training goals, marketing focus, and branding interests For more information, please contact: U.S Corporate and Government ... UNIX and Linux System Administration Handbook Backup devices and media 299 Optical media: CD-R/RW, DVD±R/RW, DVD-RAM, and Blu-ray 299 Portable and ... UNIX AND LINUX SYSTEM ® ® ADMINISTRATION HANDBOOK FOURTH EDITION This page intentionally left blank UNIX AND LINUX SYSTEM ® ® ADMINISTRATION HANDBOOK FOURTH EDITION Evi...
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minimal perl for unix and linux people - manning 2006
Ngày tải lên :
25/03/2014, 10:27
... 29 Quoting techniques 30 ✦ True and False values 32 Handling switches: -s 32 ✦ Using warn and die 35 Using logical and, logical or 37 ✦ Programming with BEGIN and END blocks 39 ✦ Loading modules ... must collect and process input Further details on creating Perl commands and scripts are provided in sections 2.1 and 2.4 WRITING ONE-LINE PROGRAMS 11 in addition to generating output, and doing ... tongue, and you want to discover how expressive and poetic Perl itself can be, you could have chosen no better primer than this book and no better guide than Dr Tim Maher, a gifted teacher and a...
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Minimal Perl For UNIX and Linux People 1 ppsx
Ngày tải lên :
06/08/2014, 03:20
... 29 Quoting techniques 30 ✦ True and False values 32 Handling switches: -s 32 ✦ Using warn and die 35 Using logical and, logical or 37 ✦ Programming with BEGIN and END blocks 39 ✦ Loading modules ... must collect and process input Further details on creating Perl commands and scripts are provided in sections 2.1 and 2.4 WRITING ONE-LINE PROGRAMS 11 in addition to generating output, and doing ... tongue, and you want to discover how expressive and poetic Perl itself can be, you could have chosen no better primer than this book and no better guide than Dr Tim Maher, a gifted teacher and a...
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Minimal Perl For UNIX and Linux People 2 doc
Ngày tải lên :
06/08/2014, 03:20
... one-line commands and scripts, and the fundamentals of using Perl modules But we don’t discuss everything you need to know about Perl in this chapter Further details on this chapter’s topics and more ... concentrate on the primary activity of the command—the editing operation and it’s no coincidence that it makes the command look more like the equivalent sed command shown earlier That’s because Larry ... reference purposes and demonstrated in later chapters (e.g., listings 9.3 and 9.4) Now we’ll turn our attention to Perl’s fastest and easiest-to-use mechanism for storing and retrieving data:...
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Minimal Perl For UNIX and Linux People 3 pot
Ngày tải lên :
06/08/2014, 03:20
... after consulting man ascii: 104 LHS and RHS, respectively, stand for left- and right-hand-side, and DQ stands for double quotes CHAPTER PERL AS A (BETTER) sed COMMAND ... requires a single perl process and zero pipes, no matter how many individual matches there are: perl -wnl -e '/\bESR\b/ and /\bSRV\b/ and /\bCYA\b/ and /\bFYI\b/ and print;' projects Note that ... letters, digits, and dots Domains ending in two-letter country codes other than us are “foreign” (to Americans, at least); for instance, the pl domain stands for Poland, and au stands for Australia...
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Minimal Perl For UNIX and Linux People 4 ppt
Ngày tải lên :
06/08/2014, 03:20
... requests the automatic switch processing that handles the command-line specifications of the old and new strings and loads the associated $old and $new variables with their contents The omission ... provides a handy summary of the corresponding sed and perl commands that perform basic editing tasks, along with the locations where they’re discussed in this chapter Table 4.6 sed and Perl commands ... other hand, the Shell can handle this task—if the programmer is willing to write an input-processing loop, manage a line counter, and some conditional Table 5.7 Patterns and Actions in AWK and Perl...
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Minimal Perl For UNIX and Linux People 5 pot
Ngày tải lên :
06/08/2014, 03:20
... pipeline: perl -wnl -e '-A and print;' # Example perl -wnl -e '-A and -B and print;' # Example perl -wnl -e '-A and ! -B and print;' # Example perl -wnl -e '-A and -B and -C and print;' # Example ... an Oscar and a Felix on hand In your own career, I’d advise you to develop an appreciation and an aptitude for both the quick -and- dirty and elegant -and- formal styles of programming, and to cultivate ... '( -A or -B ) and print;' # Example perl -wnl -e '( -A or -B or -C ) and print;' # Example perl -wnl -e '-A and ( -B or -C ) and -D and print;' # Example In these commands, -A, -B, and -C are placeholders...
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Minimal Perl For UNIX and Linux People 6 pptx
Ngày tải lên :
06/08/2014, 03:20
... Table 7.7 The rand function Typical invocation formats $random_tiny_number=rand; $random_larger_number=rand N; $random_element=$some_array[ rand @some_array ]; Example Explanation $num=rand; Assigns ... similarities and differences in how data flows between commands and functions 7.3.1 Comparing Unix pipelines and Perl functions Although there are distinct similarities between Unix command pipelines and ... controlled by rand to make random decisions about what to next in a program In the next section, we’ll shift our discussion to list-oriented functions and demonstrate, among other things, how rand can...
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Minimal Perl For UNIX and Linux People 7 potx
Ngày tải lên :
06/08/2014, 03:20
... string $command="fmt -$width '$file'"; # e.g., # dashed line # the heading # dashed line "fmt -62 Reuters.txt" $debug and warn "Command is:\n\t$command\n\n" and $command="set -x; $command"; # enable ... code; } a In the bottom panel, cond stands for condition and cmds stands for commands both languages, the else branch is optional, allowing that keyword and its associated components to be omitted ... "$Usage" and exit 255; # Can't have mutually-exclusive switches defined $p and defined $c and warn "$Usage\n\tCan't have -p and -c\n" $X='g'; $ON=$OFF=""; if ($d) { $ON=(`tput smso` and exit...
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Minimal Perl For UNIX and Linux People 8 docx
Ngày tải lên :
06/08/2014, 03:20
... raffle in which Andy contributes $3, and Dora $2: $ raffle -debug andy dora Inserting tickets for ANDY Inserting tickets for DORA # Debugging run Fishbowl contains: ANDY ANDY ANDY DORA DORA Selecting ... necessary to handle the files at hand Think of the alternative—if 100 files needed this processing, and you didn’t know how to use a loop, you would have to compose and submit 100 tr commands (one ... syntax and rules for using more advanced indexing techniques 9.1.2 Understanding advanced array indexing Table 9.3 shows the association between array values and indices of both the positive and...
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Minimal Perl For UNIX and Linux People 9 potx
Ngày tải lên :
06/08/2014, 03:20
... defined $verbose and warn "Examining '$_'"; # $_ holds line foreach (split) { # split line into words, and load each into $_ /\b\w\w\w\w\b/ and print "Found '$_' in: '$_'\n" and # DOESN'T WORK! ... entirety on your screen, and that lack nested loops and subroutine definitions: • Relax Enjoy the friendliness, power, and freedom of Perl Don’t use strict, don’t declare variables, and don’t worry—be ... code and accessing code obtained from others Specifically, you’ll learn how to create your own modules, how to use existing modules from Perl’s standard distribution, and how to locate, obtain, and...
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Minimal Perl For UNIX and Linux People 10 pdf
Ngày tải lên :
06/08/2014, 03:20
... obtained } $Eof and next; # handle to TYPE loop } $Eof and exit; # handle to FORMAT loop # Now construct user's command $command="ls $user_format $user_type"; # Show command, for educational ... space See also tab vs standard input, standard output, standard error These terms refer to the “standard” channels used on Unix systems for conveying input and output to programs, which ... See also masking command We distinguish between two kinds of commands A Perl command is formed by interactively typing perl and any desired arguments to the Shell A Unix command is similar, but...
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Automating UNIX and Linux Administration phần 1 potx
Ngày tải lên :
08/08/2014, 21:21
... operations ssh host1 'command1' ssh host1 'command2' ssh host2 'command3' # Finally, kill the agent and exit kill $SSH_AGENT_PID exit You could then run this script and it would prompt you for ... your public and private key pair OpenSSH provides a command just for this purpose The following command creates a 2,048-bit RSA key pair The default output files are ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub ... section If, on the other hand, you are an SSH novice, you are in for quite a surprise SSH is very easy and efficient to use and can help with a wide variety of tasks The commands in this section work...
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Automating UNIX and Linux Administration phần 2 pdf
Ngày tải lên :
08/08/2014, 21:21
... for the command If you not, a malicious user might be able to place a command with the same name earlier in the search path This text is excerpted from Chapter of "Automating Unix and Linux Administration" ... The command says to connect from the web server (which is behind the NAT router) to the client (your desktop) and connect port 80 on the server to port 8080 on the client Once this command has ... /sbin/reboot command In this specific example, you must be careful because if you connect to the account with the specified key, the system will reboot (regardless of what command the remote client...
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Study UNIX and LINUX
Ngày tải lên :
24/10/2014, 10:54
... highly simplified shell Threads in POSIX The principal POSIX thread calls The ls Command Steps in executing the command ls type to the shell 10 Flags for Linux clone Bits in the sharing_flags bitmap ... multilevel queue structure 12 Booting UNIX cp The sequences of processes used to boot some systems 13 Handling Memory Process A Process B • Process A's virtual address space • Physical memory • ... directories found in most UNIX systems 25 The UNIX File System (2) • Before linking • After linking (a) Before linking (b) After linking 26 The UNIX File System (3) • Separate file systems • After mounting...
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minimal perl for unix and linux people (2005)
Ngày tải lên :
26/10/2014, 20:49
... 29 Quoting techniques 30 ✦ True and False values 32 Handling switches: -s 32 ✦ Using warn and die 35 Using logical and, logical or 37 ✦ Programming with BEGIN and END blocks 39 ✦ Loading modules ... must collect and process input Further details on creating Perl commands and scripts are provided in sections 2.1 and 2.4 WRITING ONE-LINE PROGRAMS 11 in addition to generating output, and doing ... tongue, and you want to discover how expressive and poetic Perl itself can be, you could have chosen no better primer than this book and no better guide than Dr Tim Maher, a gifted teacher and a...
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