>>177
ん？出来るけど

[21:23 /etc] 578% pushd /System/Library/
/System/Library /etc ~
[21:23 /System/Library] 579% popd
/etc ~
[21:23 /etc] 580% dirs
/etc ~
[21:23 /etc] 581%

${host}の変更は/etc/hostconfig じゃあないかな