How do i copy a file using the terminal ? Gnome Red Hat 8.0

use the cp command.

man is your friend!

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man -k copy | grep files

File::Copy (3) - Copy files or filehandles
cp (1) - copy files and directories
cpio (1) - copy files to and from archives
hcopy (1) - copy files from or to an HFS volume
install (1) - copy files and set attributes
install [ginstall] (1) - copy files and set attributes
mcopy (1) - copy MSDOS files to/from Unix
objcopy (1) - copy and translate object files

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man man
-k Equivalent to apropos.
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man apropos
NAME
apropos - search the whatis database for strings

SYNOPSIS
apropos keyword ...

DESCRIPTION
apropos searches a set of database files containing short
descriptions of system commands for keywords and displays
the result on the standard output.

SEE ALSO
whatis(1), man(1).
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Cheers,
Tink

copy /etc/hosts to /backup/etc/hosts


example

cp /etc/hosts /backup/etc/hosts

or

cp /etc/hosts /backup/etc/