I'm too young to have lived through the era of the "Unix wars" and needlessly-incompatible differences between vendors, and so I'm lacking a lot of the historical context. However, attempts were at some point made to standardize Unix behavior into an IEEE standard called POSIX. This seems like a direction to start looking!
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伊斯蘭革命後，革命領袖阿亞圖拉·魯霍拉·霍梅尼（Ayatollah Ruhollah Khomeini）任命他為首都德黑蘭的星期五聚禮領袖。
ln -s "$right" "$tmpdir"/b