Exec with string in variables?

Ruby
1

Hi,

i have something like this and more in perl and would transform it to
ruby.
First i changed system to exec and than the points to plus , but the
strings which are in the scalar’s seems
not be applied in the exec call , perhaps some special needs with
quoting!?

:perl
foreach $line(@methoden) {
system("$exe_path" . “dti.exe -qb -t -e$line $dom_file
$train_file $modell_string” . “$line” . “.dti”);
…
}

:ruby

methoden.each do |line|
exec(“exe_path + dti.exe -qb -t -eline dom_file train_file
modell_string + line + .dti”)
…
end

many thanks christian

2

Try

exec("#{exe_path dti.exe -qb -t -eline #{dom_file} #{train_file}
#{modell_string} #{line} .dti")

Ruby needs #{variable} in quotes to parse variable. Or you could
concatenate outside the quotes like:

exec(exe_path + “dti.exe -qb…” + dom_file)

Basically, it is variable + “string” + another_variable
On Tue, 2007-04-17 at 23:55 +0900, Christian wrote:

:perl
modell_string + line + .dti")
…
end

many thanks christian

–

Thanks,

Ken M.
Wireless Operations Engineer
Farmers Wireless

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3

On Apr 17, 10:53 am, Christian [email protected] wrote:

foreach $line(@methoden) {

…
end

many thanks christian

String interpolation does this nicely:

methoden.each do |line|
exec(“#{exe_path}dti.exe -qb -t -e#{line} #{dom_file} #{train_file}
#{modell_string}#{line}.dti”)
…
end

4

On Tue, Apr 17, 2007 at 11:55:06PM +0900, Christian wrote:

:perl
foreach $line(@methoden) {
system("$exe_path" . “dti.exe -qb -t -e$line $dom_file
$train_file $modell_string” . “$line” . “.dti”);
…
}

Instead of $var write #{var}

Alternatively, let Ruby deal with the individual arguments:

system(exe_path, “-qb”, “-t”, “-e” + line, dom_file, train_file,
modell_string + line + “.dti”)

This is safer as it will work even if the arguments themselves contain
spaces.