The universal way to check if a file is available to TeX compilers is the

command-line tool kpsewhich.

$ kpsewhich tikz

/usr/share/texmf/tex/plain/pgf/frontendlayer/tikz.tex

kpsewhich will actually search for files only, not for packages.

It returns the path to the file. For more details on a specific

package use the command-line tool tlmgr(tex live only).

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