Bash Shell Base three string test and for loop

String test:

= =: Determine string equality

！ =: Judge strings are not equal

-N: Tests whether the specified string is empty

-S: Tests whether the specified string is not empty

Loop statement:

for variable in list; Do

Loop body

Done

Example:

For I in 1 2 3 4 5 6 7 8 9; Do

Addition operation

Done

Generating a list of integers

For i in {1..100}: represents 1 to 100

For i in ' SEQ 100 ': Generates one to 100 or: SEQ 2 (number of START) 2 (solid number) 10 (end number). Generates 2 4 6 8 10

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Bash Shell Base three string test and for loop