some more useful aliases

dotfiles/zsh/aliases.zsh

@@ -22,9 +22,21 @@ alias k8='kubectl'
 # Don't nuke the computer
 alias rm='rm -i'
 
+# Confirm before overwriting
+alias cp='cp -i'
+
+# Default free to sizes in megabytes
+alias free='free -m'
+
 # Better ls - lists more information for each file
 alias ll='ls -lh'
 
+# Less is a better more
+alias more=less
+
+# df in human readable sizes
+alias df='df -h'
+
 # I use Neovim
 if [ -x "$(command -v nvim)" ]; then
   alias vim=nvim