How do I redirect stdout output in Perl?
Perl’s built-in function select changes the standard output filehandle to the filehandle provided as an argument. This makes it easy to globally redirect and restore standard output. Perl’s local built-in function is another option for redirecting STDOUT.
Is there a global solution for redirecting stdout?
By definition this is not a global solution for redirecting STDOUT. A third way to redirect and restore STDOUT is to copy the STDOUT filehandle before replacing it. This copy can then be restored when required. As with select, this will have a global affect on the Perl program.
How do I redirect stdout to a specific block?
By enclosing local in a do block, the code below limits the STDOUT redirect to the block scope and STDOUT is automatically restored after the closing block brace (“}”). By definition this is not a global solution for redirecting STDOUT. A third way to redirect and restore STDOUT is to copy the STDOUT filehandle before replacing it.
How do I redirect and restore stdout?
A third way to redirect and restore STDOUT is to copy the STDOUT filehandle before replacing it. This copy can then be restored when required. As with select, this will have a global affect on the Perl program. This article was originally posted on PerlTricks.com.
How to add stderr output to Perl script?
The preferred method for this is to handle redirection via the command line, e.g. perl -w my_program.pl > my_output.txt If you want to also include stderr output then you can do this (assuming your shell is bash):
How do I get Perl help on the command-line?
Also run this to familiarize yourself with Perl’s system for accessing help info on the command-line: perldoc –help. The answer to your specific question could have been found directly by command-line searches such as these: perldoc -q captureor perldoc -q external. – FMc Mar 17 ’10 at 12:19
How to get the output of a SSH key?
If you’re using backticks try this: my @output = `ssh [email protected] “which perl”`; print “output: @output”; This is only useful if you have a publickey that the above command won’t prompt for password.
How to create /etc/passwd file using SSH?
1 The following SSH command can be used to create a file remotely. 2 This example will make a local copy of a remote /etc/passwd file to /tmp/passwd: $ ssh [email protected] ‘ ( cat /etc/passwd )’ > /tmp/passwd 3 This example will execute a script on the remote server.
How do I write to a file in Perl?
Before you launch your favourite text editor and start hacking Perl code, you may just need to redirect the program output in the terminal. On UNIX-based systems you can write to a file using “>” and append to a file using “>>”. Both write and append will create the file if it doesn’t exist.
