How do you format an external hard drive to ext4 via the command line in ubuntu?
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The command is mkfs.ext4, see its man page.
If you are ok with the default settings(1), it's just
mkfs.ext4 /dev/yourpartitionhere
Footnotes:
(1) from the man page:
The defaults of the parameters for the newly created filesystem, if not overridden by the options listed below, are controlled by the /etc/mke2fs.conf configuration file. See the mke2fs.conf(5) manual page for more details.
Rmano
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