Read e-book online Advanced bash-scripting guide PDF

By Mendel Cooper

This record is either an educational and a reference on shell scripting with Bash. It assumes no earlier wisdom of scripting or programming, yet progresses quickly towards an intermediate/advanced point of guide. The routines and heavily-commented examples invite energetic reader participation. nonetheless, it's a paintings in development. The purpose is so as to add a lot supplementary fabric in destiny updates to this record, because it evolves right into a finished ebook that fits or surpasses any of the shell scripting manuals in print.

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Within single quotes, every special character except ' gets interpreted literally. Consider single quotes ("full quoting") to be a stricter method of quoting than double quotes ("partial quoting"). Since even the escape character (\) gets a literal interpretation within single quotes, trying to enclose a single quote within single quotes will not yield the expected result. echo "Why can't I write 's between single quotes" echo # The roundabout method. echo 'Why can'\''t I write '"'"'s between single quotes' # |−−−−−−−| |−−−−−−−−−−| |−−−−−−−−−−−−−−−−−−−−−−−| # Three single−quoted strings, with escaped and quoted single quotes between.

Echo IFS='\' echo $var echo "$var" # '(] {}$" # '(]\{}$" \ converted to space. C. exit 0 Single quotes (' ') operate similarly to double quotes, but do not permit referencing variables, since the special meaning of $ is turned off. Within single quotes, every special character except ' gets interpreted literally. Consider single quotes ("full quoting") to be a stricter method of quoting than double quotes ("partial quoting"). Since even the escape character (\) gets a literal interpretation within single quotes, trying to enclose a single quote within single quotes will not yield the expected result.

Numerical Constants A shell script interprets a number as decimal (base 10), unless that number has a special prefix or notation. A number preceded by a 0 is octal (base 8). A number preceded by 0x is hexadecimal (base 16). A number with an embedded # is evaluated as BASE#NUMBER (this option is of limited usefulness because of range restrictions). Example 8−3. sh: Representation of numbers. # Decimal let "d = 32" echo "d = $d" # Nothing out of the ordinary here. # Octal: numbers preceded by '0' (zero) let "o = 071" echo "o = $o" # Expresses result in decimal.

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Advanced bash-scripting guide by Mendel Cooper


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