Get specific lines from a file?

Ruby
1

some_file.txt contains

abcd
efgh
ijkl
mnop

I want to get a specific line
I’m not saying like this though

x = File.read(‘some_file.txt’)
if x.include?(‘abcd’)
puts “abcd”

Because we are looking for ‘abcd’ in here but in my case it has to work
with any lines of a file.

(Awesome)x2 for you if this is possible without any gems anyways
post me something.

Thanks

2

cynic limbu wrote in post #1161026:

some_file.txt contains

abcd
efgh
ijkl
mnop

I want to get a specific line

File.readlines(‘some_file.txt’).grep(/abcd/)

3

Regis d’Aubarede wrote in post #1161079:

cynic limbu wrote in post #1161026:

some_file.txt contains

abcd
efgh
ijkl
mnop

I want to get a specific line

File.readlines(‘some_file.txt’).grep(/abcd/)

To be able to grep the specific content/line from a file you have to
know what string you want like in your code it’s ‘abcd’ but what I’m
asking is if we can get a line from a file without defining what string
I want.

Getting a random line would work but since it’s random we have to expect
all sort of stuff.

Here is an explanation in a language that does not exist.

x = File.read(‘some_file.txt’)
=> “abcd\nefgh\nijkl\nmnop\n”

y = get_second_line(“x”)
=> “efgh”

4

cynic limbu wrote in post #1161095:

x = File.read(‘some_file.txt’)
=> “abcd\nefgh\nijkl\nmnop\n”

y = get_second_line(“x”)
=> “efgh”

File.readlines(‘some_file.txt’)[1]

5

To get a random line you can do this:

File.readlines(‘some_file.txt’).shuffle[0]
File.readlines(‘some_file.txt’).cycle

6

File.readlines(‘some_file.txt’)[1]

You’re awesome. Thank you.