Brace expansions are used to generate sets of strings or sequences. The command echo Number_{1..5} correctly uses brace expansion to generate a sequence from 1 to 5, each prefixed with 'Number_'. The spaces in the output are due to the echo command, which outputs its arguments separated by spaces by default.
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What is brace expansion in shell scripting?
How does the echo command work in shell scripting?
Why are there spaces in the output of echo Number_{1..5}?