minimal perl for unix and linux shell programmers

... gratitude for all the good times we’ve had together brief contents Part Minimal Perl: for UNIX and Linux Users 1 Introducing Minimal Perl Perl essentials 16 Perl as a (better) grep command 53 Perl ... command 53 Perl as a (better) sed command 89 Perl as a (better) awk command 121 Perl as a (better) find command 178 Part Minimal Perl: for UNIX and Linux Shell Programmers 203 Built-in functions ... Part Minimal Perl: for UNIX and Linux Users 1 Introducing Minimal Perl 1.1 A visit to Perlistan 3 Sometimes you need a professional guide 1.2 Perl can be simple 1.3 About Minimal Perl What Minimal...

Ngày tải lên: 25/03/2014, 10:27

... gratitude for all the good times we’ve had together brief contents Part Minimal Perl: for UNIX and Linux Users 1 Introducing Minimal Perl Perl essentials 16 Perl as a (better) grep command 53 Perl ... command 53 Perl as a (better) sed command 89 Perl as a (better) awk command 121 Perl as a (better) find command 178 Part Minimal Perl: for UNIX and Linux Shell Programmers 203 Built-in functions ... Part Minimal Perl: for UNIX and Linux Users 1 Introducing Minimal Perl 1.1 A visit to Perlistan 3 Sometimes you need a professional guide 1.2 Perl can be simple 1.3 About Minimal Perl What Minimal...

Ngày tải lên: 06/08/2014, 03:20

... routinely in Minimal Perl and removed only in the rare cases where it spoils the results It’s shown here for both the sed and perl commands for uniformity PERL S INVOCATION OPTIONS 19 $ perl -wpl ... Shell and Perl assignment statements: Shell performer='Chris Bliss'; # no $, no whitespace around = Perl $performer='Chris Bliss'; # maximally Shell compatible $performer = 'Chris Bliss'; # minimally ... ' # Output Generation This next group is for commands that read input: alias alias alias alias perl_ io=' perl_ iop=' perl_ f=' perl_ fp=' perl perl perl perl -wnl -wpl -wnla -wpla ' ' ' ' # # #...

Ngày tải lên: 06/08/2014, 03:20

... Explanation /perl/ Looks for a match with perl in $_ Matches perl in $_ m :perl: Same, except uses different delimiters Matches perl in $_ $data =~ /perl/ i Looks for a match Matches perl PERL Perl ... Unix and Perl commands for common grepping activities Unix command Perl counterpart Type of task Section grep 'RE' F perl -wnl -e '/RE/ and print;' F Show matching lines 3.3.1 grep -v 'RE' F perl ... 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 ...

Ngày tải lên: 06/08/2014, 03:20

... COMMAND Note, however, that the use of $$ isn’t appropriate for commands: $ perl -wpl -i.$$ -e 's /UNIX/ Linux/ g;' os In cases like this, $$ is a Shell variable that accesses the PID of the Shell ... of AWK and Perl next NOTE 5.2 AWK is totally AWKsome, but Perl is even better; it’s Perlicious! COMPARING BASIC FEATURES OF awk AND PERL This section provides an overview of how AWK and Perl compare ... $total, as in $total += $_ CHAPTER PERL AS A (BETTER) awk COMMAND Table 5.8 AWK and Perl programs for simple tasks AWK a Perl b Explanation

Ngày tải lên: 06/08/2014, 03:20

... '-A and ! -B and print;' # Example perl -wnl -e '-A and -B and -C and print;' # Example perl -wnl -e '( -A or -B ) and print;' # Example perl -wnl -e '( -A or -B or -C ) and print;' # Example perl ... 201 P A R T Minimal Perl: for UNIX and Linux Shell Programmers P art focused on ways in which simple Perl programs can provide superior alternatives to standard Unix commands Along the way, you ... use a special kind of find | perl pipeline for filtering out undesirable arguments for Unix utilities, and how to use Unix utilities for validating arguments for Perl programs 6.4 PROCESSING...

Ngày tải lên: 06/08/2014, 03:20

... nearest relative in Unix or the Shell Table 7.8 Useful Perl functions for lists, and their nearest relatives in Unix Built-in Perl function Unix relative(s) sort The Unix sort command List sorting ... 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...

Ngày tải lên: 06/08/2014, 03:20

... back-quote syntax for command substitution, of the form $(command) INTERPOLATING COMMAND OUTPUT INTO SOURCE CODE 269 Table 8.6 Command substitution/interpolation in the Shell and Perl Shell a Perl Explanation ... backslashes, quotes, commas, and semicolons Table 8.9 shows the syntax for eval in both the Shell and Perl Table 8.9 The eval function in the Shell and Perl Shell Perl eval 'command' error=$? (( $error ... submit a command to the OS-dependent command interpreter (/bin/sh on Unix) for execution 18 See http://TeachMePerl.com/DQs_in _shell_ vs _perl. html for further details EXECUTING OS COMMANDS USING...

Ngày tải lên: 06/08/2014, 03:20

... variable The syntax for the Shell s for loop is shown in table 10.5 alongside that of its Perl counterpart, foreach Table 10.5 The Shell s for loop and Perl s foreach loop Shell a Perl for var in LIST ... quality value The Shell s for loop is similar to Perl s foreach loop, not Perl s for loop LOOPING WITH for Although the Shell s for is like Perl s foreach, Perl does have a for loop of its own, ... $index=rand @fortunes; # select random index CHAPTER LIST VARIABLES 27 28 29 30 31 32 printf $fortunes[ $index ]; # print random fortune delete $fortunes[ $index ]; # mark fortune undefined @fortunes=grep...

Ngày tải lên: 06/08/2014, 03:20

... (such as “perlcheat”, “perltoot”, and “perlguts”) TIP 10.8 You can use the only Shell loop that Larry left out of Perl by getting the Shell: :POSIX::Select module from the CPAN SUMMARY Perl provides ... executing its shell function, using what’s known as the CPAN -shell command: perl -M'CPAN' -e 'shell; ' If you get the following response, CPAN is already configured for your system, and you’re ready ... contrast Perl subroutines with Shell user-defined functions, because functions are different in many ways, and many Shell programmers aren’t familiar with them anyway CHAPTER 1 SUBROUTINES AND VARIABLE...

Ngày tải lên: 06/08/2014, 03:20

... xxv for loop 345–349 good for index-oriented array processing 345 for loop (Perl) syntax of 345 for loop (Shell) 331 compared to Perl s foreach 340 foreach loop 340–344 compared to Shell s for ... distributed with SuSE Linux version 10, which are v2.5.1 for grep, egrep, and fgrep; v4.1.4 for sed; v3.1.4 for gawk; v4.2.3 for find; and v3.00.16(1) for bash See also UNIX, Unix, GNU, POSIX clobberation ... last FORMAT; # leave loops once final choice obtained } $Eof and next; # handle to TYPE loop } $Eof and exit; # handle to FORMAT loop # Now construct user's command $command="ls $user_format...

Ngày tải lên: 06/08/2014, 03:20

... gratitude for all the good times we’ve had together brief contents Part Minimal Perl: for UNIX and Linux Users 1 Introducing Minimal Perl Perl essentials 16 Perl as a (better) grep command 53 Perl ... command 53 Perl as a (better) sed command 89 Perl as a (better) awk command 121 Perl as a (better) find command 178 Part Minimal Perl: for UNIX and Linux Shell Programmers 203 Built-in functions ... Part Minimal Perl: for UNIX and Linux Users 1 Introducing Minimal Perl 1.1 A visit to Perlistan 3 Sometimes you need a professional guide 1.2 Perl can be simple 1.3 About Minimal Perl What Minimal...

Ngày tải lên: 26/10/2014, 20:49

... three Unix/ Linux backup commands: tar, dump, and dd (or cpio) • Operate the tape device via the mt command • Develop a backup strategy that meets your needs as well as your users’ Unix and Linux ... notes Unix/ Linux Backup Commands • tar • dump • dd • cpio (in Appendix) Unix and Linux Backups – SANS GIAC LevelOne © 2000, 2001 The archival commands we will discuss here are tar, dump, and dd ... to • Use Unix/ Linux backup commands: tar, dump, and dd • Operate the tape device via the mt command • Develop a backup strategy that meets your needs as well as your users Unix and Linux Backups...

Ngày tải lên: 17/01/2014, 08:20

... open and configured, a program can send and receive data through it In both Windows and Linux the serial port is treated as a file, and the file read and write operations are used to send data to and ... directions, and, because it 0, has separate pins for transmit and receive, a device //security attributes can send and receive data at the same time Sending //0 here means that this file handle and receiving ... port These are to open the serial port, configure HANDLE fileHandle; the serial port, read and write bytes to and from the fileHandle = serial port, and close the serial port when the task has CreateFile(...

Ngày tải lên: 05/11/2013, 20:15

... host name or address shell_ command is a command to be executed when the rule fires UNIX/ Linux Auditing – SANS GIAC LevelOne © 2000, 2001 30 The format of both the hosts.allow and hosts.deny files ... sure wtmp and btmp files exist • Run who to look for unexpected users • Run last to look for unexpected logins • Run lastb to look for failed login attempts • Backup log files UNIX/ Linux Auditing ... appropriate server program and goes away UNIX/ Linux Auditing – SANS GIAC LevelOne © 2000, 2001 28 On a UNIX operating system, the Internet daemon, inetd, listens for connections and services them upon...

Ngày tải lên: 17/01/2014, 08:20

... UNIX AND LINUX SYSTEM ® ® ADMINISTRATION HANDBOOK FOURTH EDITION This page intentionally left blank UNIX AND LINUX SYSTEM ® ® ADMINISTRATION HANDBOOK FOURTH EDITION Evi ... informit.com/ph Library of Congress Cataloging-in-Publication Data UNIX and Linux system administration handbook / Evi Nemeth [et al.] —4th ed p cm Rev ed of: Unix system administration handbook, ... for backups 298 Prepare for the worst 298 xiv UNIX and Linux System Administration Handbook Backup devices and...

Ngày tải lên: 19/03/2014, 13:36

... Command line options and keywords are also indicated with the courier bold font Command line examples may or may not include the command line prompt and output text from the results of the command ... authentication methods for use with SSH: username and password, public/private keys and Kerberos Username and Password Although supported, Tenable does not recommend using a username and password for authentication ... patches and operating system settings Please email any comments and suggestions to support@tenable.com Nessus leverages the ability to log into remote Unix hosts via Secure Shell (SSH) For Windows...

Ngày tải lên: 22/03/2014, 15:21

... following command creates a 2,048-bit RSA key pair The default output files are ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub for the private and public keys, respectively The command prompts you for a passphrase ... also more work (and therefore slower) when the computer encrypts and decrypts data Since SSH only uses RSA/DSA when it is This text is excerpted from Chapter of "Automating Unix and Linux Administration" ... >/dev/null # Now, ask for the key once ssh-add # Now, perform a bunch of SSH operations ssh host1 'command1' ssh host1 'command2' ssh host2 'command3' # Finally, kill the agent and exit kill $SSH_AGENT_PID...

Ngày tải lên: 08/08/2014, 21:21

... path 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 ... reboot the system and nothing more no-port-forwarding,command="/sbin/reboot",no-pty ssh-rsa AB YZ Whoever possesses the specified private key cannot open an interactive shell or forward ports They ... account on the system for each user who needs to run commands as root 2.12.1 Preparing for Common Accounts The setup is actually very simple You generate a key pair for each user and then list the...

Ngày tải lên: 08/08/2014, 21:21

... previous alarm POSIX Shell A 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 ... UNIX User Interface The layers of a UNIX system UNIX Utility Programs A few of the more common UNIX utility programs required by POSIX UNIX Kernel Approximate structure of generic UNIX ... System V The UNIX File System (1) Some important directories found in most UNIX systems The UNIX File System (2) • Before linking • After linking (a) Before linking (b) After linking The UNIX File...

Ngày tải lên: 18/10/2014, 15:30