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Thanks. I'm adding a ChangeLog entry for this change: 2023-01-16 Paul Eggert sigpipe tests: Modernize use of 'head'. POSIX no longer requires support for =E2=80=98head -1=E2=80=99. * tests/test-sigpipe.sh: Use =E2=80=98head -n1=E2=80=99 rather than =E2=80= =98head -1=E2=80=99. * tests/test-sigpipe.c (main): Likewise. * lib/git-merge-changelog.c (main): Update comment accordingly.