Fixed:

echo a | parallel -qX echo  "'"{}"' "
Trailing \ in regex m/\'{}\'\/ at /home/tange/bin/parallel line 479, <STDIN> line 1.

echo a | parallel -qX echo  "'{}'"
<<infinite loop>>

Makefile

@@ -2,12 +2,17 @@ parallel.1: parallel
 	pod2man parallel > parallel.1
 
 install: parallel parallel.1
-	cp parallel /usr/local/bin/parallel
-	cp parallel.1 /usr/local/man/man1/parallel.1
+	install -D -m 755 parallel $(DESTDIR)/usr/bin/parallel
+	install -D -m 644 parallel.1 $(DESTDIR)/usr/share/man/man1/parallel.1
 
 unittest: parallel unittest/tests-to-run/* unittest/wanted-results/*
+	echo | mop || (echo mop is required for unittest; /bin/false)
+	seq 1 2 | mop || (echo seq is required for unittest; /bin/false)
 	(cd unittest; sh Start.sh)
 
+clean:
+	rm -f parallel.1
+
 dist:
 	rm -rf ./unittest/input-files/random_dirs_*_newline || /bin/true
 	rm -rf ./unittest/tmp || /bin/true

parallel

@@ -245,7 +245,9 @@ characters. For example this B<will not work>:
 
 B<ls | parallel -q "diff {} foo >>B<{}.diff"> 
 
-because > needs to be interpreted by the shell.
+B<ls | parallel -q "ls {} | wc -l">
+
+because > and | need to be interpreted by the shell.
 
 If you get errors like:
 
@@ -292,8 +294,10 @@ the last half of the line is from another process.
 If no command is given to B<xargs> it defaults to /bin/echo. So the
 B<cat | sh> functionality is missing.
 
-Quoting in B<xargs> works like B<-q> in B<parallel>. Doing B<ls |
-parallel "wc {} >> B<{}.wc"> using B<xargs> seems to be impossible.
+Quoting in B<xargs> works like B<-q> in B<parallel>. This means
+composed commands and redirection is impossible: B<ls | parallel "wc
+{} >> B<{}.wc"> or B<ls | parallel "echo {}; ls {}|wc"> cannot be done using
+B<xargs>.
 
 
 =head1 BUGS
@@ -301,6 +305,8 @@ parallel "wc {} >> B<{}.wc"> using B<xargs> seems to be impossible.
 Filenames beginning with '-' can cause some commands to give
 unexpected results, as it will often be interpreted as an option.
 
+Some Bash specific constructs like '<(cmd)' do not work.  They can be
+fixed by prepending '/bin/bash -c'. How much slower will that be?
 
 =head1 REPORTING BUGS
 
@@ -474,7 +480,8 @@ sub generate_command_line {
 			push @all_word_arg, $substituted;
 		    }
 		    my $all_word_arg = join(" ",@all_word_arg);
-		    $job_line =~ s/$wordarg/$all_word_arg/;
+		    my ($quoted_wordarg) = shell_quote($wordarg);
+		    $job_line =~ s/$quoted_wordarg/$all_word_arg/;
 		}
 	    } else {
 		# Normal replace
@@ -855,11 +862,17 @@ sub print_job {
     }
     seek $_, 0, 0 for $out, $err;
     if($Global::debug) {
-	while( <$err> ) { print STDERR "ERR: $_" }
-	while( <$out> ) { print STDOUT "OUT: $_" }
-    } else {
-	print STDERR <$err>;
-	print STDOUT <$out>;
+	print STDERR "ERR:\n";
+    }
+    my $buf;
+    while(sysread($err,$buf,1000_000)) {
+	print STDERR $buf;
+    }
+    if($Global::debug) {
+	print STDOUT "OUT:\n";
+    }
+    while(sysread($out,$buf,1000_000)) {
+	print STDOUT $buf;
     }
     debug("<<joboutput $command\n");
     close $out;

parallel.1

@@ -124,7 +124,7 @@
 .\" ========================================================================
 .\"
 .IX Title "PARALLEL 1"
-.TH PARALLEL 1 "2009-04-27" "perl v5.10.0" "User Contributed Perl Documentation"
+.TH PARALLEL 1 "2009-08-26" "perl v5.10.0" "User Contributed Perl Documentation"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l
@@ -347,7 +347,9 @@ characters. For example this \fBwill not work\fR:
 .PP
 \&\fBls | parallel \-q "diff {} foo \fR>\fB{}.diff"\fR
 .PP
-because > needs to be interpreted by the shell.
+\&\fBls | parallel \-q \*(L"ls {} | wc \-l\*(R"\fR
+.PP
+because > and | need to be interpreted by the shell.
 .PP
 If you get errors like:
 .PP
@@ -392,12 +394,17 @@ the last half of the line is from another process.
 If no command is given to \fBxargs\fR it defaults to /bin/echo. So the
 \&\fBcat | sh\fR functionality is missing.
 .PP
-Quoting in \fBxargs\fR works like \fB\-q\fR in \fBparallel\fR. Doing \fBls |
-parallel "wc {} \fR> \fB{}.wc"\fR using \fBxargs\fR seems to be impossible.
+Quoting in \fBxargs\fR works like \fB\-q\fR in \fBparallel\fR. This means
+composed commands and redirection is impossible: \fBls | parallel "wc
+{} \fR> \fB{}.wc"\fR or \fBls | parallel \*(L"echo {}; ls {}|wc\*(R"\fR cannot be done using
+\&\fBxargs\fR.
 .SH "BUGS"
 .IX Header "BUGS"
 Filenames beginning with '\-' can cause some commands to give
 unexpected results, as it will often be interpreted as an option.
+.PP
+Some Bash specific constructs like '<(cmd)' do not work.  They can be
+fixed by prepending '/bin/bash \-c'. How much slower will that be?
 .SH "REPORTING BUGS"
 .IX Header "REPORTING BUGS"
 Report bugs to <bug\-parallel@tange.dk>.

unittest/actual-results/test10

@@ -8,3 +8,5 @@ b35d8e49be8d94899b719c40d3f1f4bb  -
       6  119994  697800
 1c0c49286e5b5b18437e51b438ea5475  -
 Chars per line: 116300
+'a' 
+'a'

unittest/tests-to-run/test08.sh

@@ -2,7 +2,9 @@
 
 cd input-files/test08
 
-ls | parallel -q  perl -ne '/_PRE (\d+)/ and $p=$1; /hatchname> (\d+)/ and $1!=$p and print $ARGV,"\n"'
+ls \
+| parallel -q  perl -ne '/_PRE (\d+)/ and $p=$1; /hatchname> (\d+)/ and $1!=$p and print $ARGV,"\n"' \
+| sort
 
 seq 1 10 | parallel -j 1 echo | sort
 seq 1 10 | parallel -j 2 echo | sort

unittest/tests-to-run/test10.sh

@@ -15,3 +15,7 @@ echo -n "Chars per line: "
 CHAR=$(cat ~/.mop/:parallel | wc -c)
 LINES=$(cat ~/.mop/:parallel | wc -l)
 echo "$CHAR/$LINES" | bc
+
+# Bug before 2009-08-26 causing regexp compile error or infinite loop
+echo a | parallel -qX echo  "'"{}"' "
+echo a | parallel -qX echo  "'{}'"

unittest/wanted-results/test10

@@ -8,3 +8,5 @@ b35d8e49be8d94899b719c40d3f1f4bb  -
       6  119994  697800
 1c0c49286e5b5b18437e51b438ea5475  -
 Chars per line: 116300
+'a' 
+'a'