標(biāo)題: Titlebook [打印本頁] 作者: morphology 時間: 2025-3-21 19:48 作者: Fluctuate 時間: 2025-3-21 21:23 作者: 在駕駛 時間: 2025-3-22 03:39
https://doi.org/10.1007/978-3-030-40208-2es used for configuration purposes, which are initially set to default values. In this chapter we’ll look at various methods of testing variables and setting default values. The differences between many of these syntactical variants are subtle, but each is useful for working with undefined variables, setting variable defaults, and debugging.作者: Mediocre 時間: 2025-3-22 08:00 作者: MUTED 時間: 2025-3-22 11:13
https://doi.org/10.1007/978-3-319-65166-8f a fairly crucial difference in the behavior of the two shells. In both pdksh and bash, the last command of a pipeline is performed in a subshell. This means that a variable assigned within the subshell is not available to the parent shell. In ksh, the last command of a pipeline is executed in the original shell.作者: conflate 時間: 2025-3-22 15:13 作者: conflate 時間: 2025-3-22 18:01 作者: Jogging 時間: 2025-3-23 00:50 作者: 溫室 時間: 2025-3-23 04:34
Notizenaus den Ietzten Lebensjahren,se. expect has much more functionality than I cover in this chapter, but this chapter provides a good example of how it can be used. To find more complete information, you can consult the expect manual page.作者: 無聊點好 時間: 2025-3-23 07:15
Date and Time Manipulationbecause there are precise numbers of seconds, minutes, and hours in a day. It gets tricky, though, when you consider the fact that values have to roll over when, for example, Monday turns into Tuesday or June becomes July.作者: 女歌星 時間: 2025-3-23 13:31 作者: 可卡 時間: 2025-3-23 14:04
Data Redirection and write operations. The forms and syntax of redirection are varied and their meanings are specific. I will cover some of the common uses here, and provide a bit more explanation than system man pages to aid you in avoiding pitfalls.作者: Thyroiditis 時間: 2025-3-23 21:56 作者: Malcontent 時間: 2025-3-23 23:07
cronule. Normally these tasks are performed on systems that run 24 hours a day, 7 days a week. Writing cron scripts to perform system maintenance, backups, monitors, or any other job that you would want to run on a schedule is a very common task. There are a few subtleties with cron however, that many users and administrators may be unaware of.作者: aneurysm 時間: 2025-3-24 04:21
Self-Linked Scriptsns all the code necessary to perform a number of tasks, but you may want to determine the specific task to be performed at runtime by calling the script by a specific name. This lets users invoke an individual task by name without having to learn specialized command-line switches for the options they want.作者: GENRE 時間: 2025-3-24 07:44 作者: 證實 時間: 2025-3-24 10:46
Automating User Input with expectse. expect has much more functionality than I cover in this chapter, but this chapter provides a good example of how it can be used. To find more complete information, you can consult the expect manual page.作者: accrete 時間: 2025-3-24 18:09
Philosophy of Engineering and TechnologyIt is possible to set a normal (direct) variable in three ways:. In all of these cases, although you might not know a variable’s value in advance of any given point, you do know the name of the variable that is to receive the value.作者: Thrombolysis 時間: 2025-3-24 19:15 作者: 完成才會征服 時間: 2025-3-25 01:31
Indirect Reference VariablesIt is possible to set a normal (direct) variable in three ways:. In all of these cases, although you might not know a variable’s value in advance of any given point, you do know the name of the variable that is to receive the value.作者: 無彈性 時間: 2025-3-25 04:13
Math from the ShellMathematical calculations are an important element of writing shell scripts. In the various flavors of UNIX, there are multiple ways to perform just about any task, and mathematical tasks are no exception.作者: 無思維能力 時間: 2025-3-25 09:57 作者: 威脅你 時間: 2025-3-25 14:51 作者: carotid-bruit 時間: 2025-3-25 16:49
The functional calculus approach,because there are precise numbers of seconds, minutes, and hours in a day. It gets tricky, though, when you consider the fact that values have to roll over when, for example, Monday turns into Tuesday or June becomes July.作者: 思想上升 時間: 2025-3-25 22:32
Industrial Gas-Turbine Lubrication,atements (if/then and case) and iteration statements (while). They give you the ability to examine relationships between data items, such as files, variables, strings, and numeric values, and to take action based on the result. You can also carry out actions based on the attributes of a particular i作者: genesis 時間: 2025-3-26 00:37
Luc Boltanski und die Literatursoziologieng utility uses optional parameters. It creates archives and restores directory and file trees, but it can do so in different ways. The GNU version of tar has roughly 80 different options that can be used in various combinations to tailor the ways in which the utility performs. The major benefit of 作者: RAGE 時間: 2025-3-26 06:33
https://doi.org/10.1007/978-3-030-40208-2es used for configuration purposes, which are initially set to default values. In this chapter we’ll look at various methods of testing variables and setting default values. The differences between many of these syntactical variants are subtle, but each is useful for working with undefined variables作者: 警告 時間: 2025-3-26 11:37 作者: 古董 時間: 2025-3-26 14:15
Palgrave Innovations in Philosophy and write operations. The forms and syntax of redirection are varied and their meanings are specific. I will cover some of the common uses here, and provide a bit more explanation than system man pages to aid you in avoiding pitfalls.作者: Altitude 時間: 2025-3-26 18:26
https://doi.org/10.1007/978-3-319-65166-8f a fairly crucial difference in the behavior of the two shells. In both pdksh and bash, the last command of a pipeline is performed in a subshell. This means that a variable assigned within the subshell is not available to the parent shell. In ksh, the last command of a pipeline is executed in the 作者: Amnesty 時間: 2025-3-27 00:38
The Ludic Impulse in Post-Postmodern Fictionule. Normally these tasks are performed on systems that run 24 hours a day, 7 days a week. Writing cron scripts to perform system maintenance, backups, monitors, or any other job that you would want to run on a schedule is a very common task. There are a few subtleties with cron however, that many u作者: embolus 時間: 2025-3-27 02:07
Jeroen Groenendijk,Floris Roelofsenns all the code necessary to perform a number of tasks, but you may want to determine the specific task to be performed at runtime by calling the script by a specific name. This lets users invoke an individual task by name without having to learn specialized command-line switches for the options the作者: paroxysm 時間: 2025-3-27 08:42 作者: 是突襲 時間: 2025-3-27 13:25
The , and Agostini’s Utopianismty to recall and modify previous commands quickly and efficiently is beneficial. In the old DOS days, a utility called . would keep your history in a buffer. You could go back or forth through the command history one command at a time by using the up and down arrow keys. Individual commands could be作者: erythema 時間: 2025-3-27 16:14 作者: 束縛 時間: 2025-3-27 20:35
Notizenaus den Ietzten Lebensjahren,se. expect has much more functionality than I cover in this chapter, but this chapter provides a good example of how it can be used. To find more complete information, you can consult the expect manual page.作者: 有危險 時間: 2025-3-27 23:51
Shell Script Debuggingis one of them. Debugging code is a significant part of writing code. No matter how disciplined you are or how skilled you become at coding, you will have bugs in your code, in the form of either syntax or logic errors. The syntactical problems tend to be simpler to resolve since many times they sho作者: Commentary 時間: 2025-3-28 03:34
Standard Function Libraryplicated functions again, and other times I would copy and paste the code from an earlier script. But the best coding practice is to keep a file around that contains all of your already tested and working functions. This creates a scriptwriter’s toolbox, or, in programming speak, a library. With a l作者: Vasodilation 時間: 2025-3-28 09:13
Date and Time Manipulationbecause there are precise numbers of seconds, minutes, and hours in a day. It gets tricky, though, when you consider the fact that values have to roll over when, for example, Monday turns into Tuesday or June becomes July.作者: Interstellar 時間: 2025-3-28 14:04
Comparisons and Testsatements (if/then and case) and iteration statements (while). They give you the ability to examine relationships between data items, such as files, variables, strings, and numeric values, and to take action based on the result. You can also carry out actions based on the attributes of a particular i作者: 壯觀的游行 時間: 2025-3-28 15:22
Accepting Command-Line Options, Switches, and Parametersng utility uses optional parameters. It creates archives and restores directory and file trees, but it can do so in different ways. The GNU version of tar has roughly 80 different options that can be used in various combinations to tailor the ways in which the utility performs. The major benefit of 作者: 投票 時間: 2025-3-28 21:13
Testing Variables and Assigning Defaultses used for configuration purposes, which are initially set to default values. In this chapter we’ll look at various methods of testing variables and setting default values. The differences between many of these syntactical variants are subtle, but each is useful for working with undefined variables作者: 厭食癥 時間: 2025-3-29 02:01 作者: 辮子帶來幫助 時間: 2025-3-29 06:40 作者: 軍火 時間: 2025-3-29 08:41 作者: 正面 時間: 2025-3-29 14:30
cronule. Normally these tasks are performed on systems that run 24 hours a day, 7 days a week. Writing cron scripts to perform system maintenance, backups, monitors, or any other job that you would want to run on a schedule is a very common task. There are a few subtleties with cron however, that many u作者: Irrigate 時間: 2025-3-29 16:55
Self-Linked Scriptsns all the code necessary to perform a number of tasks, but you may want to determine the specific task to be performed at runtime by calling the script by a specific name. This lets users invoke an individual task by name without having to learn specialized command-line switches for the options the作者: explicit 時間: 2025-3-29 21:05
Throttling Parallel Processeslarge environment. With relatively small environments, you could simply write a script that loops through a list of systems and performs the desired task serially on each machine. Another method would be to loop through the list of machines and submit your job to the background so the tasks are perf作者: 連累 時間: 2025-3-30 03:18
Command-Line Editing and Historyty to recall and modify previous commands quickly and efficiently is beneficial. In the old DOS days, a utility called . would keep your history in a buffer. You could go back or forth through the command history one command at a time by using the up and down arrow keys. Individual commands could be作者: Impugn 時間: 2025-3-30 04:10
Scripting from the Command Lineth me; pretty much anything you can do in a shell script, you can also do from the command line. I’ve coded many ad hoc scripts right at the command line. I wouldn’t recommend writing anything significant that way, but for quickies it’s just the ticket.作者: Chronological 時間: 2025-3-30 09:00 作者: 文字 時間: 2025-3-30 13:04
LP-Structure in Real Banach Spaceshout error, but the resulting output does not match the design of the program. The more complex your code becomes as your skill increases, the more difficult these types of problems will be to detect.作者: FLAIL 時間: 2025-3-30 20:29 作者: 釘牢 時間: 2025-3-30 22:06 作者: Mobile 時間: 2025-3-31 04:24 作者: Pander 時間: 2025-3-31 08:07
https://doi.org/10.1007/978-3-030-63868-9ormed in parallel. Neither of these methods scales well when you run a large environment, however. Processing the list sequentially is not an efficient use of resources and can take a long time to complete.作者: degradation 時間: 2025-3-31 11:50 作者: CLOUT 時間: 2025-3-31 13:56
Accepting Command-Line Options, Switches, and Parametersthis technique is that you can write a single program and have it perform multiple tasks based on the command-line input. Additionally, you’re not duplicating code by writing smaller, more specific scripts tailored to each individual task.作者: 賠償 時間: 2025-3-31 18:35
