Chris Johnson's Pro Bash Programming Scripting the GNULinux Shell PDF

By Chris Johnson

ISBN-10: 1430219971

ISBN-13: 9781430219972

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Sa; Displaying Command-Line Arguments pre=: post=: printf "$pre%s$post\n" "$@" The special parameter $@ expands to a list of all the command-line arguments, but the results differ depending on whether it is quoted. When quoted, it expands to the positional parameters "$1", "$2", "$3", "$4", and so on, and the arguments containing whitespace will be preserved. If $@ is unquoted, splitting will occur wherever there is whitespace. When a line is executed, whether at the command prompt or in a script, the shell splits the line into words wherever there is unquoted whitespace.

Sa \ this "is a" 'demonstration of' \ : this: :is a: :demonstration of: : : :quotes and escapes: quotes\ and\ escapes Quotes can be embedded in a word. Inside double quotes, a single quote is not special, but a double quote must be escaped. Inside single quotes, a double quote is not special. $ sa "a double-quoted single quote, '" "a double-quoted double quote, \"" :a double-quoted single quote, ': :a double-quoted double quote, ": $ sa 'a single-quoted double quotation mark, "' :a single-quoted double quotation mark, ": All characters inside a single-quoted word are taken literally.

There are three types of parameters: positional parameters, special parameters, and variables. Positional parameters are arguments present on the command line, and they are referenced by number. Special parameters are set by the shell to store information about aspects of its current state, such as the number of arguments and the exit code of the last command. Their names are nonalphanumeric characters (for example, *, #, and _). Variables are identified by a name. What’s in a name? I’ll explain that in the “Variables” section.

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Pro Bash Programming Scripting the GNULinux Shell by Chris Johnson

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