toAbsolutePath filename
i1 : toAbsolutePath "a/b.m2" o1 = /workspace/repo-tools/run-upstream-build/macaulay2-1.24.05+ds/M2/ Macaulay2/packages/Macaulay2Doc-temporary/a/b.m2
Paths of the form foo/x/../bar, are shortened to foo/bar without checking the file system to see whether x is a symbolic link. For the other behavior, see realpath.
The object toAbsolutePath is a function closure.