命令fg在Unix與類Unix系統中屬於作業控制命令，其功能是喚醒掛起的進程將之移至前台（因而同時會將進程的輸入輸出流移至用戶終端）繼續執行[1]。操作系統內是否包含fg命令亦是「POSIX兼容」的判斷標準之一[2] 。
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