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awk 'BEGIN{ commands } pattern{ commands } END{ commands }'

BEGIN {awk-commands}

/pattern/ {awk-commands}

END {awk-commands}

1)    张三    语文    80
2)    李四    数学    90
3)    王五    英语    87

$ awk 'BEGIN{printf "序号\t名字\t课程\t分数\n"} {print}' marks.txt

序号    名字    课程    分数
1)    张三    语文    80
2)    李四    数学    90
3)    王五    英语    87