how to ommit space

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how to ommit column

Good afternoon, just wanna ask how to ommit, for example column 2 $cat file 1 2 3 4 1 2 3 4 5 1 2 3 1 2 1 2 3 4 5 6 output: 1 3 4 1 3 4 5 1 3 1 1 3 4 5 6

Shell Programming and Scripting