coreutils: Multi-call invocation

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1 2.14 ‘coreutils’: Multi-call program
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1 The ‘coreutils’ command invokes an individual utility, either implicitly
1 selected by the last component of the name used to invoke ‘coreutils’,
1 or explicitly with the ‘--coreutils-prog’ option.  Synopsis:
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1      coreutils --coreutils-prog=PROGRAM ...
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1    The ‘coreutils’ command is not installed by default, so portable
1 scripts should not rely on its existence.
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