12-19-2014
Quote:
Originally Posted by
ongoto
I like the shell; don't get me wrong. But just to keep it interesting...
uname is shell, chomp is perl:
uname is not shell! Perl is using a shell here, but it doesn't need to. You should use fork() and exec() to run it more efficiently. But then you would need to set up pipes and such to connect it and worry about closing them after -- all the things BASH does without you even thinking about it. Perl has none of this. It shoves it all into BASH and forgets.
Or you could throw out the perl and not worry about any of it. If you're controlling external processes, you should be using shell, because perl is really bad at it.
( chomp() is not really needed here either. The shell makes do fine without it, but Perl takes things a little too literally. )
Quote:
...and then there is the arrays and string juggling, which is where perl shines.
Perl is terrific at string juggling, but modern shells have arrays. Even better, they have and have always had lists...
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT CENTOS
string::shellquote
ShellQuote(3) User Contributed Perl Documentation ShellQuote(3)
NAME
String::ShellQuote - quote strings for passing through the shell
SYNOPSIS
$string = shell_quote @list;
$string = shell_quote_best_effort @list;
$string = shell_comment_quote $string;
DESCRIPTION
This module contains some functions which are useful for quoting strings which are going to pass through the shell or a shell-like object.
shell_quote [string]...
shell_quote quotes strings so they can be passed through the shell. Each string is quoted so that the shell will pass it along as a
single argument and without further interpretation. If no strings are given an empty string is returned.
If any string can't be safely quoted shell_quote will croak.
shell_quote_best_effort [string]...
This is like shell_quote, excpet if the string can't be safely quoted it does the best it can and returns the result, instead of dying.
shell_comment_quote [string]
shell_comment_quote quotes the string so that it can safely be included in a shell-style comment (the current algorithm is that a sharp
character is placed after any newlines in the string).
This routine might be changed to accept multiple string arguments in the future. I haven't done this yet because I'm not sure if the
strings should be joined with blanks ($") or nothing ($,). Cast your vote today! Be sure to justify your answer.
EXAMPLES
$cmd = 'fuser 2>/dev/null ' . shell_quote @files;
@pids = split ' ', `$cmd`;
print CFG "# Configured by: ",
shell_comment_quote($ENV{LOGNAME}), "
";
BUGS
Only Bourne shell quoting is supported. I'd like to add other shells (particularly cmd.exe), but I'm not familiar with them. It would be
a big help if somebody supplied the details.
AUTHOR
Roderick Schertler <roderick@argon.org>
SEE ALSO
perl(1).
perl v5.16.3 2010-06-11 ShellQuote(3)