backtick not printing the 'echo'ed line

[dn_perl]

I want to print a line using shell script via perl.

Contents of the file 'myshell' are :
-------------
#!/bin/csh
echo "line from shell script" ;
-------------

Contents of the file 'myperl' are :
-------------
#!/bin/perl
use strict ;
`myshell` ;
-------------

If I run 'myperl' it prints nothing on my monitor.
But if I replace backticks with 'system' call, the line in the shell
script is printed.

New contents of 'myperl' are :
-------------
#!/bin/perl
use strict ;
system ("myshell") ;
-------------

Why doesn't the 'echo' statement in the shell-script print on the
monitor when backticks are used?

TIA.

 

[Ben Morrow]

Quoth (e-mail address removed) ([email protected]):

I want to print a line using shell script via perl.

Contents of the file 'myshell' are :
-------------
#!/bin/csh
echo "line from shell script" ;
-------------

Contents of the file 'myperl' are :
-------------
#!/bin/perl
use strict ;
`myshell` ;
-------------

If I run 'myperl' it prints nothing on my monitor.
But if I replace backticks with 'system' call, the line in the shell
script is printed.

New contents of 'myperl' are :

This is the converse of the FAQ 'Why can't I get the output of a command with
system()?'.

Ben

 

[Brian McCauley]

Quoth (e-mail address removed) ([email protected]):

`myshell` ;

[...] it prints nothing on my monitor.

This is the converse of the FAQ 'Why can't I get the output of a command with
system()?'.

Yes, and it is also a FAQ in its own right: 'What's wrong with using
backticks in a void context?'

Those that will not learn from the FAQ are condemned to repeat it.

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