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/bin/zsh4-static is in zsh-static 5.0.7-5+b1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/zsh5-static -f

# This wrapper's sole purpose is to ease the migration of zsh's binary
# location from /bin/zsh4 to /bin/zsh5 between Debian Wheezy and Jessie.
#
# See https://bugs.debian.org/707760 for reasoning, details and
# discussion.

if [[ "$0" == *zsh4* ]]; then
    static=''
    if [[ "$0" == *static* ]]; then
        static=-static
    fi

    echo ""
    echo "    ####"
    echo "    ####  $0 is deprecated, please switch to /bin/zsh${static} (or /usr/bin/zsh)"
    if [[ "$1" == "-l" || "$0" == -* ]]; then
        echo '    ####  Use "chsh -s '"/bin/zsh${static}"'" to change your login shell'
    fi
    echo "    ####  This command ($0) will disappear eventually!"
    echo "    ####"
    echo ""
fi 1>&2

exec "/bin/zsh5${static}" "$@"