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Replaces tabs in output with spaces. Uses perl since sed seems to work differently across platforms.
There are 3 alternatives - vote for the best!
If you can do better, submit your command here.
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just use expand
expand file_with_tabs.txt
Your use of cat is redundant.
An example of "useless use of cat", and gratuitous use of perl.
If you want to convert tabs to an appropriate number of spaces, use the expand tool.
If you want to convert tabs to single spaces, use the tr tool.
May not be the best way to get rid of tabs, but that command lets you replace tabs with whatever you want, not just space.