ctags

Generates an index (or tag) file of language objects found in source files for many popular programming languages. More information: <https://ctags.io/>.

Alpine
RUN apk add ctags
Arch Arch Linux
RUN pacman -S --noconfirm ctags
CentOS
RUN yum install -y ctags
Fedora
RUN dnf install -y ctags
click the source code to copy install ctags on any operating system with command-not-found.com