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I have the following install script for ubuntu :

#!/bin/bash



sudo apt update

sudo apt full-upgrade -y

sudo apt install jq

sudo apt autoclean -y

sudo apt autoremove

will the following work under fedora, red hat, mageia or other rpm-based distros

...or does the syntax have to change more?

#!/bin/bash



sudo rpm update

sudo rpm full-upgrade -y

sudo rpm install jq

sudo rpm autoclean -y

sudo rpm autoremove

also can I do something to the effect of the following? :

#!/bin/bash

if [ $(command -v yum) ]

then

    sudo yum update

    sudo yum full-upgrade -y

    sudo yum install jq

    sudo yum autoclean -y

    sudo yum autoremove

else

    sudo rpm update

    sudo rpm full-upgrade -y

    sudo rpm install jq

    sudo rpm autoclean -y

    sudo rpm autoremove

fi

rpm is mostly equivalent to dpkg, not apt; the apt equivalent is yum (on RHEL and CentOS up to release 7), or dnf (on Fedora, and RHEL and CentOS starting with release 8), or zypper (on SuSE). For your specific commands:

sudo dnf distro-sync

sudo dnf install jq

sudo dnf clean all

sudo dnf autoremove

or

sudo yum upgrade

sudo yum install jq

sudo yum clean all

(This works because jq is packaged under the same name in both cases. This isn’t always true; a given piece of software can be packaged under different names in different distributions or even different releases of a given distribution.)

See the Pacman Rosetta and the Ubuntu RHEL migration guide for details.

You might want to look into configuration management tools instead, they will help you abstract the differences away (or at least, deal with them more robustly).

Your if [ $(command -v yum) ] test is flawed because yum can be installed on Debian derivatives (including Ubuntu); its presence doesn’t mean it’s the package manager. You should probably detect the running operating system and base your choice on that; see How can I reliably get the operating system's name? for details.

No, the options and arguments to apt and yum are different, so are package names in a lot of cases.

You also seem to be getting rpm and yum confused, yum is the equivalent of apt, rpm is the equivalent of dpkg. dpkg is the backend for apt, rpm is the backend for yum.

You will have to look at the man pages for both apt and yum to find the equivalent options. Alternativly you could look at a configuration management tool like puppet which will abstract a lot of OS differences between distros, but this may be overkill for what you're doing.