Essential Books

Bash Parameter Expansion

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Bash Parameter Expansion:
*Bash Parameter Expansion
*Modifying the case of alphabetic characters
*Length of parameter
*Replace pattern in string
*Substrings and subarrays
*Delete a pattern from the beginning of a string
*Parameter indirection
*Default value substitution
*Delete a pattern from the end of a string
*Parameter expansion and filenames
*Error if variable is empty or unset
*Munging during expansion
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