How to add \n for perl one liner

soy_vivi · 06-21-2016, 05:00 PM

Hello everyone,

I thank you in advance your input.

I can run this perl one line statement

Code:

[user@server ~]# perl -le 'print (1 .. 10);'
12345678910

How would I produce the same output without the -l? I have tried

I get a blank output

Code:

[user@server ~]# perl -e '$twenty = (1 .. 20); print "$twenty\n";'

I get an error message

Code:

[user@server ~]# perl -e 'print (1 .. 20); . "\n";'

keefaz · 06-21-2016, 05:17 PM

Code:

perl -e '$\="\n"; print (1 .. 10);'
perl -e 'use v5.10;say (1 .. 10);'
perl -e 'print 1 .. 10, "\n";'

There are surelly more ways to do it

soy_vivi · 06-21-2016, 05:26 PM

Keefaz, thank you for your input. I'm just getting into Perl and couldn't get past this question.

Turbocapitalist · 06-21-2016, 11:11 PM

While going through the examples you might check the meaning of the run time options, too. It should be in the manual page "perlrun"

Code:

man perlrun

The -n and -p are very useful as they wrap loops around your one-liner. The -i does in-place editing so this one-liner replaces the word "foo" if it is a whole word with the word "bar" through out all files with names ending in .txt The original, untouched files will end in .txt.old

Code:

perl -pi.old -e 's/\bfoo\b/bar/g' *.txt

It was a recipe something like that which piqued my interest in perl originally.