cheat-fork-echo/cheat/cheatsheets/truncate

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# To clear the contents from a file:
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truncate -s 0 file.txt
# To truncate a file to 100 bytes:
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truncate -s 100 file.txt
# To truncate a file to 100 KB:
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truncate -s 100K file.txt
# (M, G, T, P, E, Z, and Y may be used in place of "K" as required.)