How can Perl s print add a newline by default

Question

In Perl most of my print statements take the form  print  hello       n     Is there a nice way to avoid keeping all the pesky   n s lying around   I know I could make a new function such as myprint that automatically appends  n  but it would be nice if I could override the existing print

User · Answer

Here s what I found at https   perldoc perl org perlvar html           The output record separator for the print operator  If defined  this value is    printed after the last of print s arguments  Default is undef       You cannot call output record separator   on a handle  only as a static method     See IO  Handle       Mnemonic  you set    instead of adding   n  at the end of the print  Also  it s    just like      but it s what you get  back  from Perl    example           n   print  a newline will be appended to the end of this line automatically

User · Answer

In Perl 6 there is  the say function

User · Answer

If Perl 5 10  is not an option  here is a quick and dirty approximation   It s not exactly the same  since say has some magic when its first arg is a handle  but for printing to STDOUT   sub say  print       n    say  hello

User · Answer

Perl 6 has the say function that automatically appends  n   You can also use say in Perl 5 10 or 5 12 if you add  use feature qw say     to the beginning of your program   Or you can use Modern  Perl to get this and other features   See perldoc feature for more details

User · Answer

If you re stuck with pre-5 10  then the solutions provided above will not fully replicate the say function  For example  sub say   print       n       Will not work with invocations such as  say for  arr    or   for   arr        say          because the above function does not act on the implicit global    like print and the real say function   To more closely replicate the perl 5 10  say you want this function  sub say       if        print       n         else   print       n         Which now acts like this  my  arr   qw  alpha beta gamma    say  arr    OUTPUT   alphabetagamma   say for  arr    OUTPUT   alpha   beta   gamma     The say builtin in perl6 behaves a little differently  Invoking it  with say  arr or  arr say will not just concatenate the array items  but instead prints them separated with the list separator  To replicate this in perl5 you would do this  sub say       if        print join             n         else   print        n            is  the global list separator variable  or if you re using English pm then is is  LIST SEPARATOR  It will now act more like perl6  like so  say  arr    OUTPUT   alpha beta gamma

User · Answer

The way you re writing your print statement is unnecessarily verbose   There s no need to separate the newline into its own string   This is sufficient   print  hello  n     This realization will probably make your coding easier in general   In addition to using use feature  say  or use 5 10 0 or use Modern  Perl to get the built in say feature  I m going to pimp perl5i which turns on a lot of sensible missing Perl 5 features by default

User · Answer

You can use the -l option in the she-bang header       usr bin perl -l   text    hello    print  text  print  text    Output   hello hello

User · Answer

Perhaps you want to change your output record separator to linefeed with   local        n      perl -e  print q hello  print q goodbye     od -c 0000000    h   e   l   l   o   g   o   o   d   b   y   e                 0000014   perl -e       qq  n   print q hello  print q goodbye     od -c 0000000    h   e   l   l   o   n   g   o   o   d   b   y   e   n         0000016   Update  my answer speaks to capability rather than advisability   I don t regard adding   n  at the end of lines to be a  pesky  chore  but if someone really wants to avoid them  this is one way   If I had to maintain a bit of code that uses this technique  I d probably refactor it out pronto

[perl] How can Perl's print add a newline by default?

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