Menu
What's the quickest, easiest way to read the first line only from a file? I know you can use file, but in my case there's no point in wasting the time loading the whole file.
Preferably a one-liner.
805
The head command is used to display the beginning of a text file or piped data. By default, it displays the first ten lines of the specified files. The tail command is also used to display the ending part of the file.
The readline() method helps to read just one line at a time, and it returns the first line from the file given. We will make use of readline() to read all the lines from the file given. To read all the lines from a given file, you can make use of Python readlines() function.
Well, you could do:
$f = fopen($file, 'r'); $line = fgets($f); fclose($f); It's not one line, but if you made it one line you'd either be screwed for error checking, or be leaving resources open longer than you need them, so I'd say keep the multiple lines
If you ABSOLUTELY know the file exists, you can use a one-liner:
$line = fgets(fopen($file, 'r')); The reason is that PHP implements RAII for resources.
That means that when the file handle goes out of scope (which happens immediately after the call to fgets in this case), it will be closed.
140
$firstline=`head -n1 filename.txt`; 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
