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AWK print line no.x to line no.y

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# 1  
Old 09-09-2011
AWK print line no.x to line no.y
I am learning AWK and quite fresh now.

My Q: How could I use AWK to print lines from e.g. first to 8th, or 5th to 9th?

Thanks!!!
# 2  
Old 09-09-2011
Code:
#From 1 to 8
awk 'NR<=8 {print}' file

#Between 5 and 9 inclusive
awk 'NR>=5 && NR<=9 {print}' file

You can use FNR if you have multiple files.
NR is the total number of records for all the files.
FNR is specific to each file bring processed. FNR will be reset when a new file comes in.

Try this code to find the difference
Code:
awk '{print NR "-" FNR}' file1 file2

--ahamed
This User Gave Thanks to ahamed101 For This Post:
cristalp
# 3  
Old 09-09-2011
Quote:
Originally Posted by ahamed101
Code:
#From 1 to 8
awk 'NR<=8 {print}' file

#Between 5 and 9 inclusive
awk 'NR>=5 && NR<=9 {print}' file

You can use FNR if you have multiple files.
NR is the total number of records for all the files.
FNR is specific to each file bring processed. FNR will be reset when a new file comes in.

Try this code to find the difference
Code:
awk '{print NR "-" FNR}' file1 file2

--ahamed
Thanks Ahamed!! It works. But then, if I just want to print one line, say 9th line.
Code:
awk 'NR =9 {print}' FILENAME

gave me all the lines in the file. How can I just print one specific line according to line number then?

Thanks again!!
# 4  
Old 09-09-2011
Quote:
Originally Posted by cristalp
...
Code:
awk 'NR =9 {print}' FILENAME

gave me all the lines in the file. How can I just print one specific line according to line number then?
...
You have to compare and not assign.

Code:
$
$
$ cat f20
This is line 1
This is line 2
This is line 3
This is line 4
This is line 5
This is line 6
This is line 7
This is line 8
This is line 9
This is line 10
$
$ awk 'NR==9 {print}' f20
This is line 9
$
$
$ awk 'NR=9 {print}' f20
This is line 1
This is line 2
This is line 3
This is line 4
This is line 5
This is line 6
This is line 7
This is line 8
This is line 9
This is line 10
$
$

Comparison is true only for line 9, hence it prints only line 9.
Assignment is true for each line, hence it prints each line.

tyler_durden
This User Gave Thanks to durden_tyler For This Post:
cristalp
# 5  
Old 09-15-2011
Quote:
Originally Posted by durden_tyler
You have to compare and not assign.

Code:
$
$
$ cat f20
This is line 1
This is line 2
This is line 3
This is line 4
This is line 5
This is line 6
This is line 7
This is line 8
This is line 9
This is line 10
$
$ awk 'NR==9 {print}' f20
This is line 9
$
$
$ awk 'NR=9 {print}' f20
This is line 1
This is line 2
This is line 3
This is line 4
This is line 5
This is line 6
This is line 7
This is line 8
This is line 9
This is line 10
$
$

Comparison is true only for line 9, hence it prints only line 9.
Assignment is true for each line, hence it prints each line.

tyler_durden
Thanks Tyler. Now I understand. Thanks for the excellent explanation!
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