Move or rename files matching a specified extended glob pattern. See also
zcpandzln. More information: https://zsh.sourceforge.net/Doc/Release/User-Contributions.html.
zmv '{{(*).log}}' '{{$1.txt}}'
zmv -n '{{(*).log}}' '{{$1.txt}}'
zmv -i '{{(*).log}}' '{{$1.txt}}'
zmv -v '{{(*).log}}' '{{$1.txt}}'