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Example one: ``` spack install --add x y z ``` is equivalent to ``` spack add x y z spack concretize spack install --only-concrete ``` where `--only-concrete` installs without modifying spack.yaml/spack.lock Example two: ``` spack install ``` concretizes current spack.yaml if outdated and installs all specs. Example three: ``` spack install x y z ``` concretizes current spack.yaml if outdated and installs *only* concrete specs in the environment that match abstract specs `x`, `y`, or `z`. |
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