mirror of https://github.com/tLDP/LDP
48 lines
1.6 KiB
Bash
48 lines
1.6 KiB
Bash
#!/bin/bash
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# array-ops.sh: More fun with arrays.
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array=( zero one two three four five )
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# Element 0 1 2 3 4 5
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echo ${array[0]} # zero
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echo ${array:0} # zero
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# Parameter expansion of first element,
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#+ starting at position # 0 (1st character).
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echo ${array:1} # ero
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# Parameter expansion of first element,
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#+ starting at position # 1 (2nd character).
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echo "--------------"
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echo ${#array[0]} # 4
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# Length of first element of array.
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echo ${#array} # 4
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# Length of first element of array.
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# (Alternate notation)
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echo ${#array[1]} # 3
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# Length of second element of array.
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# Arrays in Bash have zero-based indexing.
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echo ${#array[*]} # 6
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# Number of elements in array.
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echo ${#array[@]} # 6
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# Number of elements in array.
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echo "--------------"
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array2=( [0]="first element" [1]="second element" [3]="fourth element" )
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# ^ ^ ^ ^ ^ ^ ^ ^ ^
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# Quoting permits embedding whitespace within individual array elements.
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echo ${array2[0]} # first element
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echo ${array2[1]} # second element
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echo ${array2[2]} #
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# Skipped in initialization, and therefore null.
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echo ${array2[3]} # fourth element
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echo ${#array2[0]} # 13 (length of first element)
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echo ${#array2[*]} # 3 (number of elements in array)
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exit
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