5 Minute Lessons in Shell Script Programming: Extraction Operators
This is a short 5 minute lesson about "extraction" operators in shell scripting. These operators allow the programmer to extract pieces and portions of a value contained in a shell variable, environment variable, or indexed array variable.
${VARIABLE:OFFSET} Extract a substring from VARIABLE value beginning at OFFSET
${VARIABLE:OFFSET:LENGTH} Extract a substring from VARIABLE value beginning at OFFSET with a specifid LENGTH
${ARRAY[*]:OFFSET}
${ARRAY[@]:OFFSET} Extract a subset of ARRAY elements beginning at index OFFSET
${ARRAY[*]:OFFSET:LENGTH}
${ARRAY[@]:OFFSET:LENGTH} Extract a subset of ARRAY elements beginning at index OFFSET including LENGTH number of elements
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