列印第幾行內容 shell

hldemacbook-air:~ hl$ more file.txt 

line 1
line 2
line 3
line 4
line 5
line 6
line 7
line 8
line 9
line 10
hldemacbook-air:~ hl$

tail -n +9 filename     從第9行輸出

head -n 1 filename    輸出前1行

hldemacbook-air:~ hl$ tail -n +9 file.txt 

line 9
line 10
hldemacbook-air:~ hl$ 
hldemacbook-air:~ hl$ tail -n +9 file.txt | head -n 1
line 9
hldemacbook-air:~ hl$

hldemacbook-air:~ hl$ sed -n '9p' file.txt 

line 9
hldemacbook-air:~ hl$ sed -n '9,10p' file.txt 
line 9
line 10
hldemacbook-air:~ hl$

nr     ordinal number of the current record

fnr    ordinal number of the current record in the current file
hldemacbook-air:~ hl$ awk nr==9 file.txt file.txt
line 9
hldemacbook-air:~ hl$ awk fnr==9 file.txt file.txt
line 9
line 9
hldemacbook-air:~ hl$

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