unix shell script if statement example

Shell Script Debugging

... example shell script Neither can I, Im just an example shell script The output is a verbose trace of the script s execution. Note that the lines without the plus sign are the output of the script ... more difficult to find when I want them removed. CHAPTER 1 ■ SHELL SCRIPT DEBUGGING9 If these three lines were executed in a script, only the output from the first two would be displayed. If ... just an example shell script& quot;fiNote that the set -x line is currently commented out. When this script is entered in the file example and run, the behavior is as expected.$ . /example Can...

Tài liệu Cơ bản về Linux Shell Script pdf

Danh mục: Kỹ thuật lập trình

... lệnh của Unix đều cã thÓ viÕt trong shell script. Shell script rÊt tiÖn lợi trong việc gộp nhiều lệnh độc lập vào một và thực hiện nhiều lần. Ngoài những lệnh đơn giản của hệ thống Unix, shell ... có ít nhất là một loại shell và thông thờng Bourne shell đợc sử dụng để viết shell script, còn sử dụng một loại khác cho việc tơng tác. Tệp /etc/passwd sẽ xác định loại shell nào sẽ đợc sử dụng ... VÝ dô chuyÓn tõ Bourne shell sang C shell: exec csh hoặc có thể đổi shell mới bằng lệnh: chsh [<tên shell& gt;] Cấu trúc lệnh chsh nh sau: chsh [-s <tên shell& gt;] [ -l ] [<tên...

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Tài liệu Cơ bản về Linux Shell Script ppt

Danh mục: Hệ điều hành

Tài liệu Bài 4: Shell script, hệ thống log, quản lý tiến trình, dịch vụ cron_Âu Bửu Long ppt

Danh mục: Tin học văn phòng

... P<#M//BQ#0:##K##0:R;<NK##%K##+%K##K% Mng trong shell script ãMng:ãTp hp cỏc giỏ tr d liu c lu tr qua mt tờn chungãGing nh bin: khụng cn khai...

Learning the bash shell - unix shell programming

Danh mục: An ninh - Bảo mật

... similar shells,including the standard Bourne shell, the POSIX shell standard, the Korn shell (ksh), the public-domain Korn shell (pdksh), and the Z Shell (zsh).Appendix B contains lists of shell ... Parallelization8.6. Subshells8.6.1. Subshell Inheritance8.6.2. Nested Subshells8.7. Process Substitution9. Debugging Shell Programs9 Intended AudienceThis book is designed to address casual UNIX and ... programmablecompletion.23 1.1. What Is a Shell? 1.2. Scope of This Book1.3. History of UNIX Shells1.3.1. The Bourne Again Shell 1.3.2. Features of bash1.4. Getting bash1.5. Interactive Shell Use1.5.1. Commands,...

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mastering unix shell scripting, 2nd edition

Danh mục: Kỹ thuật lập trình

... Style in Shell Scripts 6Control Structures 8 if then statement 8 if then else statement 8 if then elif (else) statement 9for in statement 9while statement 9until statement 9case statement ... ScriptingChapter 1 Scripting Quick Start and Review 3Case Sensitivity 3 UNIX Special Characters 3Shells 4 Shell Scripts 4Functions 4Running a Shell Script 5Declare the Shell in the Shell Script 6Comments ... exist.Running a Shell Script A shell script can be executed in the following ways:ksh shell_ script_ namewill create a Korn shell and exe cute the shell_ script_ name in the newly createdKorn shell environment....

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mastering unix shell scripting

Danh mục: Kỹ thuật lập trình

... exist.Running a Shell Script A shell script can be executed in the following ways:ksh shell_ script_ namewill create a Korn shell and execute the shell_ script_ name in the newly createdKorn shell environment. shell_ script_ namewill ... the shell script. If no shell is declared on the first line of the shell script, it willexecute in the default shell, which is the user’s system-defined shell. Executing in anunintended shell ... Declare the Shell in the Shell Script Declare the shell! If we want to have complete control over how a shell script is goingto run and in which shell it is to execute, we MUST declare the shell in...

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michael-mastering unix shell scripting

Danh mục: Tin học

... ################################################################################## End of script Listing 1.1 script. stub shell script starter listing. (continued)The shell script starter shown in Listing 1.1 gives you the framework to start writingthe shell script with ... the shell script is written.Control StructuresThe following control structures will be used extensively. if then Statement if [ test_command ]thencommandsfi if then else Statement if [ ... line.When a shell script has to be rewritten for each operating system, a combined shell script is shown at the end of the chapter that joins the Unix flavor differences togetherinto one shell script...

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Cấu hình Unix shell

Danh mục: Quản trị mạng

... <=>?.#4I&;w#tvoC!C;# This is a comment: simple hello shell script &#xJ!"U#"!;4Fx";?!;4&#x2#I!;4G;;!&?;Uox3#&#!&C;Ft#tFg"4#!?!?...

Shell script, quản lý người dùng, log, quản lý tiến trình, dịch vụ cron

Danh mục: Hệ điều hành

... {} \;find / –name “*a*” –type d –exec ls -l {} \; Cỏc lnh c bn v mngãifconfigãnslookupãtracerouteãpingãroute Shell script, quản lý người dùng, log,quản lý tiến trình, dịch vụ cronÂu Bửu ... các giá trị thời gian bằng wildcard *ã VD:30 0 * * * root rm /home/someuser/tmp/* Mng trong shell script ãTp hp cỏc giỏ tr d liu c lu tr qua mt tờn chungãGing nh bin: khụng cn khai bỏo trc khi ... tiến trình khác trong h thng.ã getty:c khi to bi initQun lý terminal.ã login: Qun lý ng nhpã shell: Sau khi ng nhp hon tất Dch v cronã Ta cú th ch nh quỏ trỡnh chy c th qua file cuhỡnh:...

Viết shell script như thế nào

Danh mục: Kỹ thuật lập trình

... ÊÔƠrƯĐƠrăărââârêôrơ-rđr rơr 2. cde20fde 30dg0 trrur ́„7 ! ! SHELL_ LINUX 4-18 4 SHELL _LINUX''44444444'': ĂràƠrắt q Ê ẵãrrá rẵƠrá rãt rãrơártrẵâ ... ỗốẻấỏrrÔrêqá rẵrtrèrạơđ Ărqrrả Ărđằrrãrrq rđr Ăôtr qá ĂrẵrvqrrrƯĐộờộvqrstru SHELL_ LINUX 12-18 12 SHELL _LINUXd012 0 !!)ÂSH777"77Iãrở-ủầớẩuỡrrrrrùr ãrũrããrắtrắqvãrắqvãrurôrrrô ... ,ì&87ỉô-rã Ărơ-rẳrẳrvqrqrqq d012 ÂS!ẹ3 2ẹ3!9? 2Z1n0ử q sãÃrq rẳr ̀ SHELL_ LINUX 14-18 14 SHELL _LINUXãld08\ 0 ãld0ã rurpqárẳ Ărq rãrĂqqrẳ Ărq rêôrqrurÃĐròrêÃròrồrvqrrẵrđrƠêƠr...

Mastering unix shell scripting phần 1 pdf

Danh mục: Kỹ thuật lập trình

... Contents of the script. If no shell is declared, the script will execute in the default shell, defined bythe system for the user executing the shell script. If the script was written, for example, to ... exist.Running a Shell Script A shell script can be executed in the following ways:ksh shell_ script_ namewill create a Korn shell and execute the shell_ script_ name in the newly createdKorn shell environment. shell_ script_ namewill ... the shell script. If no shell is declared on the first line of the shell script, it willexecute in the default shell, which is the user’s system-defined shell. Executing in anunintended shell...

Mastering unix shell scripting phần 2 pdf

Danh mục: Kỹ thuật lập trình

... this method when I write shell scripts because it can be difficult tomaintain through the code life cycle. If a user is not familiar with using file descriptors,then a script using this method ... Automating Event NotificationIn a shell script there are times when you want to send an automated notification. Asan example, if you are monitoring filesystems and your script finds that one ... 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 script. ...

Mastering unix shell scripting phần 3 ppsx

Danh mục: Kỹ thuật lập trình

... things a little differently because this is a learningprocess. As we all know, there are many ways to accomplish the same task in Unix; shell scripting is a prime example. To make our scripts a little ... these statements we use command substitution, specified by the $(command _statement) notation, to execute a command statement and assign theresult to the variable specified. In the first statement ... then use the shell script default values to measure the filesystem and return an appropriate returncode to the calling script. So, if a modification is made to the exceptions file, the script needs...