Re^2: how to find the length of any line of file -- oneliner

He! no need of BEGIN block nor say and chomp

perl -lne "print length and exit if $. == 4"

the above will work with data passed via pipe and also with a filename passed as argument.

There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

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Re^3: how to find the length of any line of file -- oneliner by Laurent_R (Canon) on Nov 23, 2017 at 10:51 UTC
Yes, Discipulus, no need for a begin block because you're hard coding the line number, whereas I wanted to pass it as an argument to the script and therefore needed to retrieve it (only once). Now, of course, for a one-liner, you might as well hard code the line number, it doesn't make a big difference.	[reply]
Re^4: how to find the length of any line of file -- oneliner by Discipulus (Canon) on Nov 23, 2017 at 11:12 UTC
Hello Laurent_R, curiously enough (for me!) `perl -lne "print length and exit if $. == $ARGV[0]" datatest.txt 4` does not complains about: `Can't open 4: No such file or directory at..` and works even without the `BEGIN` block It just runs ok with both passed as arguments, not with the data passed via pipe though. L* There are no rules, there are no thumbs.. Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.	[reply] [d/l] [select]