Can someone help to come up with Ruby one-liner to add a line at the
beginning of a file? Basically a Ruby equivalent for following sed
example-
$ sed -i "1i $variable" file.txt
--neubyr
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Posted via http://www.ruby-forum.com/.
What have you tried so far?
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On Sat, Jan 7, 2012 at 3:07 PM, Neubyr Neubyr <neubyr@gmail.com> wrote:
Can someone help to come up with Ruby one-liner to add a line at the
beginning of a file? Basically a Ruby equivalent for following sed
example-
$ sed -i "1i $variable" file.txt
Got it:
$ ruby -i -pe 'print "First Line\n" if $.==1' filename.txt
Thanks!
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Posted via http://www.ruby-forum.com/.
Love this!
(btw, you can use `puts` instead of `print "...\n"`)
Downside is it doesn't work on multiple files since Ruby's $. doesn't reset
for each file (not sure why not).
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On Sat, Jan 7, 2012 at 1:34 AM, Neubyr Neubyr <neubyr@gmail.com> wrote:
Got it:
$ ruby -i -pe 'print "First Line\n" if $.==1' filename.txtThanks!
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Posted via http://www.ruby-forum.com/\.
If you pass multiple files on the command line, they're combined
through ARGF into one long stream.
Gavin
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On Sat, Jan 7, 2012 at 10:28 PM, Josh Cheek <josh.cheek@gmail.com> wrote:
Downside is it doesn't work on multiple files since Ruby's $. doesn't reset
for each file (not sure why not).
Yeah, I guess it's basically awk's NR, but it seems like there should be
something equivalent to awk's FNR
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On Sat, Jan 7, 2012 at 5:32 AM, Gavin Sinclair <gsinclair@gmail.com> wrote:
On Sat, Jan 7, 2012 at 10:28 PM, Josh Cheek <josh.cheek@gmail.com> wrote:
>
> Downside is it doesn't work on multiple files since Ruby's $. doesn't
reset
> for each file (not sure why not).If you pass multiple files on the command line, they're combined
through ARGF into one long stream.Gavin