A small bash script that provides shortcuts for several common Salesforce DX commands.

sfdx

#!/bin/bash

case $1 in
    list)
        # sfdx list
        /usr/local/bin/sfdx force:org:list
        ;;
    push)
        if [ "$2" == "over" ] 
        then
            # sfdx push over
            /usr/local/bin/sfdx force:source:push --forceoverwrite
        else 
            # sfdx push
            /usr/local/bin/sfdx force:source:push
        fi
        ;;
    pull)
        if [ "$2" == "over" ] 
        then
            # sfdx pull over
            /usr/local/bin/sfdx force:source:pull --forceoverwrite
        else
            # sfdx pull
            /usr/local/bin/sfdx force:source:pull
        fi
        ;;
    status)
        /usr/local/bin/sfdx force:source:status -a 
        ;;
    open)
        if [ -z "$2" ]
        then
            # sfdx open - Just open the default scratch org
            /usr/local/bin/sfdx force:org:open
        else
            # sfdx open [alias]
            /usr/local/bin/sfdx force:org:open -u $2
        fi
        ;;
    login)
        # sfdx login [alias]
        /usr/local/bin/sfdx force:auth:web:login -a $2
        ;;
    delete)
        # sfdx delete [org]
        /usr/local/bin/sfdx force:org:delete -u $2
        ;;
    permset)
        # sfdx permset [permset]
        /usr/local/bin/sfdx force:user:permset:assign -n $2
        ;;
    create)
        /usr/local/bin/sfdx force:project:create --projectname $2
        ;;
    scratchme)
        # sfdx scratchme
        /usr/local/bin/sfdx force:org:create -s -f config/project-scratch-def.json -a $2
        ;;
    display)
        # sfdx display [org]
        # Gets the password
        /usr/local/bin/sfdx force:org:display -u $2
        ;;
    setpassword)
        # sfdx setpassword [alias]
        /usr/local/bin/sfdx force:user:password:generate -u $2
        ;;
    retrieve)
        #sfdx retrieve [package] [alias]
        # Retrieves a package from a production site and converts it to an SFDX project.
        sfdx force:mdapi:retrieve -s -p $2 -u $3 -r ./mdapiout
        unzip ./mdapiout/unpackaged.zip -d mdapiout
        sfdx force:mdapi:convert -r ./mdapiout -d ./force-app
        rm -rf mdapiout
        find . -name \*.dup -print | awk '{gsub(/^|$/,"\"");print;gsub(/\.dup\"$/,"\"")}1' | xargs -n2 mv
        ;;
    defaulthub)
        /usr/local/bin/sfdx force:config:set defaultdevhubusername=$2
        ;;
    default)
        /usr/local/bin/sfdx force:config:set defaultusername=$2
        ;;
    deploy)
        # sfdx deploy [alias]
        # Deploys an SFDX project to a production org.
        /usr/local/bin/sfdx force:source:convert -d ./mdapiout 
        rm -rf mdapiout/profiles
        #perl -i -pe 'BEGIN{undef $/;} s/\s+<types>\s+<name>Profile<\/name>.*?<\/types>//s' ./mdapiout/package.xml 
        /usr/local/bin/sfdx force:mdapi:deploy -d ./mdapiout -w 5 -u $2
        rm -rf mdapiout
        ;;
    *)
        /usr/local/bin/sfdx $@
        ;;
esac

Assuming you're using a Mac, and that your shell is Bash. Put this in your ~/bin folder, do a "chmod 755 sfdx", then update your .bashrc file to contain $HOME/bin at the start of your $PATH. Now you can type "sfdx list", "sfdx open", "sfdx push", etc. Easier to type, easier to remember.