Executing Multiple Shell Commands Via One Exec()-call
I wrote a PHP shell script under Linux which puts all existing
[E]PS-Files within a directory into a list and should then start a
single Ghostview window for each file. Sounds simple, but it's not:
The following code provides for about half of the functionality I
wanted:
==============code starts
$bla = array();
foreach ($filelist as $file)
{
$bla[] = fopen("./trash/".$file.".tmp", "w");
exec ("gv ".$file." &", $bla);
}
===============code ends
Here, all files are opened one after another. The next file opens only
after closing the current one. Actually I don't know whether the
redirection of the output towards .tmp-files complies with the
intended purpose of the redirection. The PHP manual states that when
starting programs in background, the output would have to be
redirected to a stream or file, otherwise PHP would continue to run
until the respective program is terminated (which I really wouldn't
care about at all, if it did so...).
Then I thought about writing the line I would type manually for
opening all ps-files ('gv bla1.ps & ; gv bla2.ps&; ...') into a string
and then executing that string:
===============code starts
$command="";
$bla = fopen("./trash/tmp", "w");
foreach ($filelist as $i => $file)
{
if ($i < count($filelist) - 1)
{
$command = $command."gv $file & ; ";
}
else
{
$command = $command."gv $file &";
}
}
exec ($command, $bla);
===============code ends
sadly I get an error message from the shell:
================ error message starts
sh: -c: line 1: syntax error near unexpected token `;'
sh: -c: line 1: `gv uges_Boden.ps & ; gv ux_Boden.ps & ; gv
uy_Boden.ps &'
================ error message ends
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