Making a shell script that generates a perl file?

[neocytrix]

Hello,

I have a quick question, how would I make a shell script that, when ran would make a perl file. Exampe: If I wanted to make a shell script that would make a perl file which said "hello" when ran. Thanks!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-Neocytrix

[ramfree17]

it would be helpful if you can give more details on what exactly (specific task) you want to do so our scripting nut and apostles can take a crack at that.

 

from a newbie pov, creating a helloworld perl script from bash would be just a direct mapping something like this

 

 #!/bin/bash

  file=hello.pl
  echo "#!/bin/perl" > $file
  echo "print hello" >> $file
  chmod +x $file

 

assuming "print hello" is how you print strings in perl. as you can see it takes twice number of lines to do it that way but would be useful if it is used in a scenario wherein certain conditions are iterated to create a meaningful set of scripts.

 

we can wait for gAru or somebody of his scripting tendencies to drop by to give you something that will automatically whiz past by my head. gAru has that tendency to show how nutty scripting can be.

 

ciao!

[Steve Scrimpshire]

This is cleaner:

#!/bin/bash

file=hello.pl
echo "#!/bin/perl" > $file
echo "print \"hello!\n\"" >> $file

 

You were close ramfree, but perl's print needs the quotes around hello, so to insert them, you have to put escaped quotes -> \" Plus the \n (newline) makes it return you back to a prompt on a (guess what) new line. :P

 

Edit: This is probably even better:

#!/bin/bash

file=hello.pl
cat > $file <<EOM
#!/bin/perl

print "hello\n";
exit;
EOM
chmod +x $file

 

 

Edit #2: Hmmmm. From the 'time' command, the first one actually is twice as fast .01 seconds as opposed to .02 seconds. Also, the first one has 332 minor pagefaults and the second has 712 minor pagefaults (whatever that means). :D

Edited April 16, 2004 by Steve Scrimpshire

[ramfree17]

i rest my case.

 

ciao!

[Steve Scrimpshire]

I'm sure aru can do it with a one-liner, though. :P