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The gunzip command is basically equivalent to the gzip command, except the -d option is always enabled by default.
The command can be invoked in this way:
gunzip filename.gz
This will gunzip and will remove the .gz extension, putting the result in the filename file. If that file exists, it will overwrite that.
You can extract to a different filename using output redirection using the -c option:
gunzip -c filename.gz > anotherfilename
The gunzip command works on Linux, macOS, WSL, and anywhere you have a UNIX environment