freebsd-ports/shells/heirloom-sh/pkg-install

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#!/bin/sh
#
# $FreeBSD$
#
JSH="$(echo ${PKG_PREFIX-/usr/local}/bin/jsh | /usr/bin/sed -e 's|//|/|g')"
SHELLS="/etc/shells"
case $2 in
POST-INSTALL)
if [ -d "${SHELLS%/*}" ] && ! grep -qs "^$JSH\$" "$SHELLS"; then
if [ $(id -u) -eq 0 ]; then
echo "$JSH" >> "$SHELLS"
else
echo "Not root, please add $JSH to $SHELLS manually"
fi
fi
;;
esac