Menu
Is it possible to extract a particular line from a file knowing its line number? For example, just get the contents of line N as a string from file "text.txt"?
551
To do this, press Esc , type the line number, and then press Shift-g . If you press Esc and then Shift-g without specifying a line number, it will take you to the last line in the file. To look for the next occurrence after the first, either press n or press / again and then press Enter .
Using “wc -l” There are several ways to count lines in a file. But one of the easiest and widely used way is to use “wc -l”. The wc utility displays the number of lines, words, and bytes contained in each input file, or standard input (if no file is specified) to the standard output.
The grep command searches through the file, looking for matches to the pattern specified. To use it type grep , then the pattern we're searching for and finally the name of the file (or files) we're searching in. The output is the three lines in the file that contain the letters 'not'.
You could get it by index from readlines.
line = IO.readlines("file.txt")[42] Only use this if it's a small file.
152
Try one of these two solutions:
file = File.open "file.txt" #1 solution would eat a lot of RAM p [*file][n-1] #2 solution would not n.times{ file.gets } p $_ file.close If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
