print given range of lines using awk, perl, head, tail and python
Print given range of lines using awk, perl, head, tail and python
Here is an example that, how we can print given range of lines using sed, awk, head, tail, perl and python methods.
In this article we are going to use rangoflines.txt file give a demonstration.
rangoflines.txt file contents
root@ankam-ubuntu:/home/aravi/scripts# cat rangoflines.txt line 1 line 2 line 3 line 4 line 5 line 6 line 7 line 8 line 10 line 11 line 12 line 13 line 14 line 15 line 16 line 17 line 18 line 19 line 20
Printing given range of lines using sed
Sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline).
$sed -n '5,9 p' rangoflines.txt
above is the sed command example to print the range from 5 to 10, out of 1-20 lines. -n option is to print ‘n’ number of lines.
in above example ‘p’ is used to Print the current pattern space.
$sed '5,9 !d' rangoflines.txt
Same as above we can also use ‘d’ Delete pattern space. Start next cycle.
2. Printing given range using awk ‘NR’ variable
Awk NR gives you the total number of records being processed or line number.
$awk 'NR >= 5 && NR <= 9' rangoflines.txt
above example to use awk for printing the given range of lines, NR > greater then line number 5 and <= less then or equal to 10 line number we are printing using above example. We can also redirect to the any awk ‘NR >= 5 && NR <= 9’ rangoflines.txt > /tmp/files9
3. Printing given range using head and tail commands
Using Linux/UNIX ‘head’ and ‘tail’ commands
$ head -9 rangoflines.txt | tail -5
We can also use below command to print the same
$ head -9 rangoflines.txt | tail -$(((9-5)+1))
as above example will also print the same from 5 to 10 lines out of 1-20 lines from rangoflines.txt file. head -9 will print 1-10 lines. tail -5 will print last 5 lines from it so the output is matching as per our requirements.
4. Printing given range of lines using vi editor
Open the rangoflines.txt file using vi editor
$ vi rangoflines.txt
then enter into the EX mode by pressing Esc key then type the below line to copy the specified range lines to /tmp/file
:5,9 w! /tmp/file
i.e. Write lines between line number 5 and line number 9 of file ‘rangoflines.txt’ to file ‘/tmp/file’
5. Alternative using perl option to print given range of lines
$ perl -ne 'print if 5..9' rangoflines.txt
as you can see above example perl command to using -ne option and print if condition to print the range of lines
6. Using python console also we can print the given range of lines
$ python Python 2.5.2 (r252:60911, Jul 22 2009, 15:35:03) [GCC 4.2.4 (Ubuntu 4.2.4-1ubuntu3)] on linux2 >>> fp = open("/tmp/file8","w") >>> for i,line in enumerate(open("rangoflines.txt")): ... if i >= 26 and i < 9 : ... fp.write(line) ... >>>
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