By Chris Johnson
ISBN-10: 1430200243
ISBN-13: 9781430200246
ISBN-10: 1590594711
ISBN-13: 9781590594711
In today’s IT setting, harried method directors are discovering themselves extra overworked than ever. This ebook is helping them regain the various misplaced time spent growing and checking out shell scripts, and courses readers via greater than a hundred and fifty much-needed and useful real-world examples. simply because all scripts present in this e-book are POSIX (Portable working method Interface)-compliant, they're supported via all significant shell variations, together with Bash, Zsh and sh, between others. dossier conversion, process management, and source tracking are only many of the subject matters coated during this hugely sensible shell scripting reference.
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Extra info for Shell Scripting Recipes: A Problem-Solution Approach (Expert's Voice in Open Source)
Example text
According to the Single UNIX Specification (SUS) glossary, a text file contains characters organised into one or more lines. The lines must not contain NUL characters and none can exceed {LINE_MAX} bytes in length, including the newline character 1 NUL is ASCII 0, a byte in which all bits are set to 0, and LINE_MAX, the maximum number of characters permissible on a line, is system-dependent; it is 2,048 on the Linux and FreeBSD systems I use. Many of the text files on a Unix system use a well-defined format.
Here is a simple session; the characters in bold are the user’s input, which do not actually appear when the script is run. $ menu=" 1. Yes 2. " $ menu1 "echo YES" "echo NO" 1. Yes 2. No ? 3 bash: Invalid entry: 3 1. Yes 2. No ? 2 NO 1. Yes 2. No ? 1 YES 1. Yes 2. No ? $NL $ menu1 "date" ":" Do you want to see today's date? 1. Yes 2. No ? y bash: Invalid entry: y 1. Yes 2. 5 ■ ARG—PROMPT FOR REQUIRED ARGUMENT IF NONE SUPPLIED 23 Do you want to see today's date? 1. Yes 2. No ? Mon Feb 7 08:55:26 EST 2005 For more elaborate menus using this function, see the conversion script in Chapter 5.
This was not clear from early versions of the standard, and a major group of otherwise POSIX-compliant shells (ash, dash, and sh on BSD systems) did not implement it. In order for the scripts in this book to work in those shells, the dollar sign is always used. Aliases Aliases are the simple replacement of a typed command with another. In a POSIX shell, they can only take arguments after the command. Their use in scripts and on the command line can be replaced entirely by functions; there are no aliases in this book.
Shell Scripting Recipes: A Problem-Solution Approach (Expert's Voice in Open Source) by Chris Johnson
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