Titlebook: Expert Shell Scripting; Ron Peters Book 2009 Ron Peters 2009 Debugging.Linux.OS X.Processing.RCS.configuration.shell scripting.system admi

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失误

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.

watertight,

Piping Input to readf 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.

ingestion

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.

ablate

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.

乱砍

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.

微粒

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.

血统

https://doi.org/10.1007/978-1-4302-1842-5Debugging; Linux; OS X; Processing; RCS; configuration; shell scripting; system administrator

PIZZA

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

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