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I wish to copy the top 1000 lines in a text file containing more than 50 million entries, to another new file, and also delete these lines from the original file.
Is there some way to do the same with a single shell command in Unix?
380
To look at the first few lines of a file, type head filename, where filename is the name of the file you want to look at, and then press <Enter>. By default, head shows you the first 10 lines of a file. You can change this by typing head -number filename, where number is the number of lines you want to see.
The head command, as the name implies, print the top N number of data of the given input. By default, it prints the first 10 lines of the specified files. If more than one file name is provided then data from each file is preceded by its file name.
head -1000 input > output && sed -i '1,+999d' input
For example:
$ cat input
1
2
3
4
5
6
$ head -3 input > output && sed -i '1,+2d' input
$ cat input
4
5
6
$ cat output
1
2
3
head -1000 file.txt > first100lines.txt
tail --lines=+1001 file.txt > restoffile.txt
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