Two tips for Linux shell: Shell arrays and string judgments

Recently, when using shell to write scripts, I want to implement two very simple functions in Python: 1: Determine if a string contains another string. 2: How to implement the list of Python work: 1. Here to share with you.

1: Determine if a string contains another string:

string= "ABCDEFG" if [["$string" =~ "abc"]];then echo "do something ..." else echo "nothing ..." Fi

The shell above determines whether "ABC" is included in the string $string.

The result of the operation is: do something.

2: Use the shell's array to reach the Python list effect.

To define an array:

# test= (a b c D E F g)

To view an array:

# echo ${test[@]}

A b c d E F g

Append an element e to the array:

# test= (${test[@]} e)

# echo ${test[@]}

A b c d E F g E

Removing an element from the subscript index, the following table of the shell array, like Python, starts at 0, so the 2 subscript represents the third element C:

# unset Test[2]

# echo ${test[@]}

A b d e F g E

Array Shard, the following command intercepts the range of elements of the test array 0-3, which is the first three elements:

# echo ${test[@]:0:3}

A b D

Iterate through an array:

# for element in ${test[@]} does echo "This is $element ..." Done#result This is b ... This is d ... This is e ... This is f ... This is g ... This is e ...

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Two tips for Linux shell: Shell arrays and string judgments