CODEWITHSUNDEEP
linuxshellsedgrepcat
Matheus Calvelli da Silva
Matheus Calvelli da Silva

Reputation: 3

How do i copy every line X line from a bunch of files to another file?

So my problem is as follows: I have a bunch of files and i need only the information from a certain line in each of these files (the same line for all files). Example: I want the content of the line 10 from file example_1.dat~example_10.dat and then i want to save it on > test.dat

I tried using: head -n 5 example_*.dat > test.dat. But this gives me all the information from the top till the line i have chosen instead of just the line. Please help.

Upvotes: 0

Views: 250

Answers (4)

potong
potong

Reputation: 58381

This might work for you (GNU sed):

sed -sn '5wtest.dat' example_*.dat

Upvotes: 0

plaskanna
plaskanna

Reputation: 26

$ for f in *.dat ; do sed -n '5p' $f >> test.dat ; done

This code will do the following:

Foreach file f in the directory that ends with .dat. Use sed on the 5:th row in file and write to test.dat. The ">>" will add the row at the bottom of the file if existing.

Upvotes: 1

Mihai Maruseac
Mihai Maruseac

Reputation: 21435

Use a combination of head and tail to zoom to the needed line. For example, head -n 5 file | tail -n 1

You can use a for loop to get it done over several files

for f in *.dat ; do head -n 5 $f | tail -n 1 >> test.dat ; done

PS: Don't forget to clean the test.dat file (> test.dat) before running the loop. Otherwise you'll get results from previous runs as well.

Upvotes: 1

Roland Jansen
Roland Jansen

Reputation: 2783

You can use sed or awk:

sed -n "5p"

awk "NR == 5"

Upvotes: 0

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