linux shell scripting cookbook by sarath lakshman

... What Linux is? Who developed the Linux? How to get Linux? How to Install Linux Where I can use Linux? What Kernel Is? What is Linux Shell? How to use Shell What is Shell Script ? Why to Write Shell ... all Linux Distributions By default bash is default shell forRed Hat Linux Distribution) All the scripts are also tested on Red Hat Linux version 7.2 LSST v1.05 > Chapter 1 > Linux Shell ... learning the shell scripting like information on Linux file system, commonLinux command reference and other resources Chapter 1 introduces to basic concepts such as what is Linux, where Linux can

Ngày tải lên: 05/11/2019, 14:32

... What Linux is? Who developed the Linux? How to get Linux? How to Install Linux Where I can use Linux? What Kernel Is? What is Linux Shell? How to use Shell What is Shell Script ? Why to Write Shell ... all Linux Distributions By default bash is default shell forRed Hat Linux Distribution) All the scripts are also tested on Red Hat Linux version 7.2 LSST v1.05 > Chapter 1 > Linux Shell ... learning the shell scripting like information on Linux file system, commonLinux command reference and other resources Chapter 1 introduces to basic concepts such as what is Linux, where Linux can

Ngày tải lên: 16/11/2019, 20:58

... What Linux is? Who developed the Linux? How to get Linux? How to Install Linux Where I can use Linux? What Kernel Is? What is Linux Shell? How to use Shell What is Shell Script ? Why to Write Shell ... all Linux Distributions By default bash is default shell forRed Hat Linux Distribution) All the scripts are also tested on Red Hat Linux version 7.2 LSST v1.05 > Chapter 1 > Linux Shell ... learning the shell scripting like information on Linux file system, commonLinux command reference and other resources Chapter 1 introduces to basic concepts such as what is Linux, where Linux can

Ngày tải lên: 17/11/2019, 07:35

... you along your Linux journey Visithttp://www.linuxtrainingacademy.com/linux-apps or click here to download your free gift Trang 9I have been working at the command line on Unix and Linux systems ... Linux command line and operating system please read my otherbook Linux for Beginners It will give you a strong foundation upon which you can build your Linuxskills Let's get started Trang 10Shell ... either directly or indirectly, by mycommand line heroes and mentors It's amazing what you can learn by watching, emulating, and takingadvice from a seasoned Unix and Linux professional Even though

Ngày tải lên: 20/03/2018, 09:14

... lệnh Linux và Shell viết kịch bản Giải pháp mạng, đám mây và an ninh mạng (Boğaziçi Üniversitesi) Trang 2Chính xácChính xác Zsh là một ví dụ về shell Chính xác Chính xác Windows không dựa trên Linux ... Linux 1 Câu hỏi 1 Phát biểu nào sau đây về Linux là KHÔNG đúng? Hệ điều hành Android được sử dụng trong nhiều điện thoại thông minh sử dụng nhân dựa trên Linux Windows dựa trên hệ điều hành Linux. ... bản phân phối Linux là KHÔNG đúng?Mỗi bản phân phối Linux được điều chỉnh cho một đối tượng hoặc nhiệm vụ cụ thể. Bản phân phối Linux còn được gọi là bản phân phối Một bản phân phối Linux phải dựa

Ngày tải lên: 09/04/2023, 22:30

... LINUX gọi là SHELL Có nhiều trình thông dịch SHELL SHELL of BOURNE (sh) của AT&T Korn SHELL (ksh) trên UNIX C SHELL (csh) của Berkeley Tenex SHELL (tcsh) Bourne Again SHELL (bash) 4 SHELL ... ĐIỀU HÀNH LINUX (SHELL) Phạm Nguyên Khang, Đỗ Thanh Nghị Email: pnkhang,dtnghi@cit.ctu.edu.vn 2 Nội dung SHELL Trình thông dịch SHELL Cấu hình phiên làm việc Lập trình SHELL 3 SHELL Tất ... ấn ENTER, SHELL sẽ đọc lệnh từ bàn phím Phân tích cú pháp (kiểm tra lỗi, tách tham số, …) Thay thế các ký tự đại diện/mở rộng các tham số (nếu có): SHELL Expansion Thực thi lệnh Ví dụ: SHELL hiển

Ngày tải lên: 04/05/2014, 21:43

... this file using themk_large_file.kshshell script) A 7,500-line file is an extremely large file to beparsing line by line in a shell script, about 600 MB, but my Linux machine is so fast that I needed ... mk_large_file.ksh shell script listing (continued) Each line produced by the mk_large_file.ksh script is the same length The userspecifies the total number of lines to create as a parameter to the shell ... of text A Korn shell script is really not meant to work on text character by character,but you can do it using various techniques The task for this chapter is to show the line- by-line parsing

Ngày tải lên: 09/08/2014, 16:20

... shell scripting section for Solaris later in this chapter Creating the Shell Scripts Now that we have the basic syntax of the commands to get paging and swap space tistics, we can start our scripting ... for the AIX shell script Take a look at the entire shell script shown inListing 6.3, and pay particular attention to the boldface type Trang 35# PLATFORM: AIX Only# # PURPOSE: This shell script ... exceptions file by MB Method(( FS_FREE_OUT = FSMB_FREE / 1000 )) echo “$FSDEVICE mounted on $FSMOUNT has ${FS_FREE_OUT}MB\ Free” \ >> $OUTFILE ;; 2) # Found exceeded in exceptions file by %Used

Ngày tải lên: 09/08/2014, 16:20

... vmstat script. Scripting with the vmstat Command When you look at this shell script for vmstat you will think that you just saw this shell script in the last section Most of these two shell scripts ... output is an average of all of the previous sample intervals This is where our shell script comes into play By using a shell script with the timesand intervals defined, we can take samples of the ... technique as we did in the last section Scripting with the iostat Command In this shell script we are going to use a very similar technique to the sar shell script in the previous section The

Ngày tải lên: 09/08/2014, 16:20

... creating this shell script When we get tothe scripting section you will see the other tasks that I have in mind, and you can pickup a pointer or two from the chapter Arrays In a Korn shell we can ... variable For shell variables you must use the shell notation here, too Ifthe number of arguments on the command line exceeds three, then we display theusagefunction and exit the shell script ... to create the mk_passwd.ksh shell script The entireshell script is shown in Listing 10.15 Pay particular attention to the boldface textthroughout the mk_passwd.ksh shell script Trang 28# PURPOSE:

Ngày tải lên: 09/08/2014, 16:20

... hgrep.ksh shell script (continued) Trang 2/usr/bin/cat $OUTPUT_FILE | /usr/bin/more;; esac rm -f $OUTPUT_FILE # End of Script Cleanup Listing 15.1 hgrep.ksh shell script (continued) In the shell ... “${pqstat[1]} Printing is ${pqstat[2]}” \ Listing 16.8 print_UP_Linux.ksh shell script listing (continued) We start off this script in Listing 16.8 by defining the $LOGFILE Notice that the lowing command, ... element 2 we can extract the first case statement to create a new shellscript Let’s call this shell script printing_only_UP_Linux.ksh You can see themodifications in Listing 16.9 Trang 26# AUTHOR:

Ngày tải lên: 09/08/2014, 16:20

... the original shell Therefore, when the script command stops executing, one of the shells in the fork terminates, but not the original shell This last exit logs out of the original shell You may ... all of the basics for the shell scripts We have three different shellscripts that are used in different ways The first script is intended to be executed atlogin time by being the last entry in ... 19.2 log_keystrokes.ksh shell script listing. Trang 14# DATE: 05/08/2002# REV: 1.0.P # PLATFOEM: Any Unix # # PURPOSE: This shell script is used to monitor a login session by # capturing all of

Ngày tải lên: 09/08/2014, 16:20

... of the other shell scripts later in this chapter.That is it for the addition shell script, but we still have four more shell scripts to go in this chapter Each of the following shell scripts ... subtraction Because this shell script is very similar tothe shell script in Listing 22.1 we are going to show the shell script and study thedetails at the end The float_subtract.ksh shell script is shown ... stopsthe loop and thus ends execution of the shell script A while loop is next in our shell script, and this loop is where all of the work is done. We start out by getting a new date/time stamp and the

Ngày tải lên: 09/08/2014, 16:20

... command line Testing User Input For any shell script it is extremely important that the information provided by the user is valid In the broadcast.ksh shell script we have the opportunity to ... individual pieces that make up thebroadcast.kshshell script, let’s look at the whole shell script and see how the piecesfit together The entire shell script is shown in Listing 25.9 Please pay ... easilyreadable script Trang 11Shelling Out to the Command LineBe extremely careful about the commands that you put into the menu Some programs are very easy to get to a shell prompt The example I

Ngày tải lên: 09/08/2014, 16:20

... Unix tools, together with the standard shell, to get your job done This is the art of shell scripting Shell scripting requires not just a knowledge of the shell language, but also a knowledge of ... shell scripts This makes shell scripting very important for extending user environments and for customizing software For a long time, there's been a conspicuous lack of a good book on shell scripting ... begins by describing compiled languages and scripting languages, and the tradeoffs between them Then it moves on, covering the very basics of shell scripting with two simple but useful shell scripts

Ngày tải lên: 12/08/2014, 10:22

... you use a script fi enable this feature by using a special first line: /<HTML>/p Only print <HTML> lines As in the shell and many other Unix scripting languages, the # is a comment ... metacharacters don't stand for themselves, how do you match one when you need to? The answer by escaping it This is done by preceding it with a backslash Thus, \* matches a literal *, \ matches a single ... In addition, individual utilities may disallow matching of the newline character by the . (dot) metacharacter or by bracket expression 3.2.2.2 eferences BREs pr expressio a mechanism, known as

Ngày tải lên: 12/08/2014, 10:22

... notify users by email when a new version of a particular shell lled eed to identify users by login shell and create a mailing list that the installer can use when announcing the new shell version ... input while IFS=: read user passwd uid gid name home shell do shell=${shell:-/bin/sh} # Empty shell field means /bin/sh file="/tmp/$(echo $shell | sed -e 's;^/;;' -e 's;/;-;g').mailing-li echo ... Berkeley C shell, csh It was intended primarily as an interactive feature It proved to be very popular, and was adopted by the Korn shell, bash, and just about every other modern Bourne-style shell

Ngày tải lên: 12/08/2014, 10:22

... build-log file Shells in the Bourne-shell family use the dot command to execute commands in the current shell, whereas shells in the C-shell family use the source command The bash and zsh shells support ... user's login shell on the remote host We carefully restrict the syntax to work in all common Unix shells so that build-all works for any user, including users with different login shells on different ... demand the same login shell everywhere, because on many systems, users cannot choose their login shells The alternative would be to pipe the command stream into the Bourne shell on each host, but

Ngày tải lên: 12/08/2014, 10:22

... (GID), full ome directory, and login shell It's a bad idea to log in as that user If the seventh field (the shell) is left empty, Unix defaults to the Bourne shell, /bin/sh As is discussed in detail ... language with byte-at-a-time input, such as C, C++, or Java, it is straightforward to write a program he presence of problematic filenames in your filesystem Sometimes they get there by simple isguising ... NUL-terminated filename lists produced by GNU find's -print0 ption xargs passes each such filename as a complete argument to the command that it runs, without danger of shell (mis)interpretation or newline

Ngày tải lên: 12/08/2014, 10:22

... interpretation by different GNU versions of egrep 11 The sort stage sorts the data by username and then by process 12 The uniq command attac 13 A second sort stage sorts the data again, this time by username, ... completion of all background ores interactive features of the shell, we note that bg, fg, jobs, and wait are shell cesses created under the current shell nd processes These characters are settable with ... which is a complex problem for some languages, is determined entirely by the sort command, which in turn is influenced by the locale set in the current environment That way, a single tool localizes

Ngày tải lên: 12/08/2014, 10:22