parallel: {%...} / {#...} is now non-greedy {%%...} / {##...}.

doc/release_new_version

@@ -241,9 +241,9 @@ from:tange@gnu.org
 to:parallel@gnu.org, bug-parallel@gnu.org
 stable-bcc: Jesse Alama <jessealama@fastmail.fm>
 
-Subject: GNU Parallel 20210422 ('Ever Given') released <<[stable]>>
+Subject: GNU Parallel 20210522 ('Palestine/Lag Ba'Omer celebrations at Mt. Meron Israel/Michael Collins <<>>') released <<[stable]>>
 
-GNU Parallel 20210322 ('Ever Given') <<[stable]>> has been released. It is available for download at: lbry://@GnuParallel:4
+GNU Parallel 20210522 ('<<>>') <<[stable]>> has been released. It is available for download at: lbry://@GnuParallel:4
 
 <<No new functionality was introduced so this is a good candidate for a stable release.>>
 
@@ -253,9 +253,7 @@ It does not have to be as detailed as Juan's. It is perfectly fine if you just s
 
 Quote of the month:
 
-  GNU Parallel is your friend.
+  <<>>
-  Can shorten that time by X cores.
-    -- iRODS @irods@twitter
   
 New in this release:
 
@@ -263,19 +261,17 @@ New in this release:
 
 News about GNU Parallel:
 
-* Bioinformatics tutorials - linux and shell advanced - parallel https://www.youtube.com/watch?v=5leL8pyl0XA
+* Batch Calculate and Verify MD5 Checksum With GNU Parallel https://omicx.cc/posts/2021-04-28-calculate-and-verify-md5-checksum-with-gnu-parallel/
 
-* GNU Parallel for quick gains https://edbennett.github.io/high-performance-python/04-gnu-parallel/index.html
+* HerrComp Gnu parallel, c++11 threads 2021 04 28 https://www.youtube.com/watch?v=wDd9F9nn0qA
 
-* Processing Linux Commands in Parallel https://www.baeldung.com/linux/processing-commands-in-parallel
+news??https://ulhpc-tutorials.readthedocs.io/en/latest/sequential/gnu-parallel/
+news?https://edbennett.github.io/high-performance-python/04-gnu-parallel/index.html
+https://www.maryamdaryalal.com/post/job-parallelization-on-niagara
+https://omicx.cc/posts/2021-04-28-calculate-and-verify-md5-checksum-with-gnu-parallel/
+https://madflex.de/use-parallel-to-split-by-line/
 
-* GNU parallel https://docs-research-it.berkeley.edu/services/high-performance-computing/user-guide/running-your-jobs/gnu-parallel/
+<<>>
-
-* GNU Parallel 활용 가이드https://genoglobe.com/kribb/gnu_parallel
-
-* Parallel Grep and Awk  https://www.highonscience.com/blog/2021/03/21/parallel-grep/
-
-* Getting things done with shell scripting https://doma.dev/blog/get-things-done-with-bash/
 
 Get the book: GNU Parallel 2018 http://www.lulu.com/shop/ole-tange/gnu-parallel-2018/paperback/product-23558902.html
 

src/parallel

@@ -2242,12 +2242,18 @@ sub init_globals() {
 	 '{:(\d+?)}' => 'substr($_,0,$$1) = ""',
 	 # Bash ${a:2:3}
 	 '{:(\d+?):(\d+?)}' => '$_ = substr($_,$$1,$$2);',
+	 # echo {#z.*z.} ::: z.z.z.foo => z.foo
+	 # echo {##z.*z.} ::: z.z.z.foo => foo
 	 # Bash ${a#bc}
-	 '{#([^#}][^}]*?)}' => 's/^$$1//;',
+	 '{#([^#}][^}]*?)}' =>
+ 	 '$nongreedy=::make_regexp_ungreedy($$1);s/^$nongreedy(.*)/$1/;',
 	 # Bash ${a##bc}
 	 '{##([^#}][^}]*?)}' => 's/^$$1//;',
+	 # echo {%.z.*z} ::: foo.z.z.z => foo.z
+	 # echo {%%.z.*z} ::: foo.z.z.z => foo
 	 # Bash ${a%def}
-	 '{%([^}]+?)}' => 's/$$1$//;',
+	 '{%([^}]+?)}' =>
+	 '$nongreedy=::make_regexp_ungreedy($$1);s/(.*)$nongreedy$/$1/;',
 	 # Bash ${a%%def}
 	 '{%%([^}]+?)}' => 's/$$1$//;',
 	 # Bash ${a/def/ghi} ${a/def/}
@@ -5931,6 +5937,37 @@ sub usleep($) {
     select(undef, undef, undef, $ms/1000);
 }
 
+sub make_regexp_ungreedy {
+    my $regexp = shift;
+    
+    my $class_state = 0;
+    my $escape_state = 0;
+    my $found = 0;
+    my $ungreedy = "";
+    my $c;
+
+    for $c (split (//, $regexp)) {
+        if ($found) {
+	    if($c ne "?") { $ungreedy .= "?"; }
+            $found = 0;
+        }
+        $ungreedy .= $c;
+
+	if ($escape_state) { $escape_state = 0; next; }
+	if ($c eq "\\") { $escape_state = 1; next; }
+	if ($c eq '[') { $class_state  = 1; next; }
+        if ($class_state) {
+	    if($c eq ']') { $class_state = 0; }
+            next;
+        }
+	# Quantifiers: + * {...}
+        if ($c =~ /[*}+]/) { $found = 1; }
+    }
+    if($found) { $ungreedy .= '?'; }
+    return $ungreedy;
+}
+
+
 sub __KILLER_REAPER__() {}
 
 sub reap_usleep() {
@@ -6481,16 +6518,15 @@ sub limit($) {
 	         limit=$1;
                  io_file=$2;
 	         # Do the measurement in the background
-	         (tmp=$(tempfile);
+	         ((tmp=$(tempfile);
 	         LANG=C iostat -x 1 2 > $tmp;
-	         mv $tmp $io_file) &
+	         mv $tmp $io_file) </dev/null >/dev/null & );
 	         perl -e '-e $ARGV[0] or exit(1);
                    for(reverse <>) {
                      /Device/ and last;
                      /(\S+)$/ and $max = $max > $1 ? $max : $1; }
-                   exit ($max < '$limit')' $io_file;
+                   exit ('$limit' < $max)' $io_file;
 	     };
-             export -f io;
              io %s %s
              !,
 	     "mem" => q!
@@ -6533,6 +6569,7 @@ sub limit($) {
     local %ENV = %env;
     $ENV{'SSHLOGIN'} = $self->string();
     system($Global::shell,"-c",$self->{'limitscript'});
+    #::qqx($self->{'limitscript'});
     ::debug("limit","limit `".$self->{'limitscript'}."` result ".($?>>8)."\n");
     return $?>>8;
 }

src/parallel.pod

@@ -1662,9 +1662,11 @@ inspired by bash's parameter expansion:
   {:-str}       str if the value is empty
   {:num}        remove the first num characters
   {:num1:num2}  characters from num1 to num2
-  {#str}        remove prefix str
+  {#regexp}     remove prefix regexp (non-greedy)
-  {%str}        remove postfix str
+  {##regexp}    remove prefix regexp (greedy)
-  {/str1/str2}  replace str1 with str2
+  {%regexp}     remove postfix regexp (non-greedy)
+  {%%regexp}    remove postfix regexp (greedy)
+  {/regexp/str} replace regexp with str
   {^str}        uppercase str if found at the start
   {^^str}       uppercase str
   {,str}        lowercase str if found at the start
@@ -4284,6 +4286,38 @@ If not all hosts are accessible through TOR:
 See more B<ssh> tricks on https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Proxies_and_Jump_Hosts
 
 
+=head2 EXAMPLE: Use outrun instead of ssh
+
+B<outrun> lets you run a command on a remote server. B<outrun> sets up
+a connection to access files at the source server, and automatically
+transfers files. B<outrun> must be installed on the remote system.
+
+You can use B<outrun> in an sshlogin this way:
+
+  parallel -S 'outrun user@server eval' command
+
+
+=head2 EXAMPLE: Slurm cluster
+
+The Slurm Workload Manager is used in many clusters.
+
+Here is a simple example of using GNU B<parallel> to call B<srun>:
+
+  #!/bin/bash
+  
+  #SBATCH --time 00:02:00
+  #SBATCH --ntasks=4
+  #SBATCH --job-name GnuParallelDemo
+  #SBATCH --output gnuparallel.out
+  
+  module purge
+  module load gnu_parallel
+  
+  my_parallel="parallel --delay .2 -j $SLURM_NTASKS"
+  my_srun="srun --export=all --exclusive -n1 --cpus-per-task=1 --cpu-bind=cores"
+  $my_parallel "$my_srun" echo This is job {} ::: {1..20}
+
+
 =head2 EXAMPLE: Parallelizing rsync
 
 B<rsync> is a great tool, but sometimes it will not fill up the

testsuite/tests-to-run/parallel-local-0.3s.sh

@@ -16,6 +16,21 @@ export -f stdsort
 # Test amount of parallelization
 # parallel --shuf --jl /tmp/myjl -j1 'export JOBS={1};'bash tests-to-run/parallel-local-0.3s.sh ::: {1..16} ::: {1..5}
 
+par_pct() {
+    echo '### Test {%...} {%%...} {#...} {##...}'
+    a=z.z.z.foo
+    echo ${a#z*z.}
+    parallel --plus echo {#z.*z.} ::: z.z.z.foo
+    echo ${a##z*z.}
+    parallel --plus echo {##z.*z.} ::: z.z.z.foo
+
+    a=foo.z.z.z
+    echo ${a%.z.z}
+    parallel --plus echo {%.z.z} ::: foo.z.z.z
+    echo ${a%%.z*z}
+    parallel --plus echo {%%.z.*z} ::: foo.z.z.z
+}
+
 par_env_parallel_pipefail() {
     cat <<'EOF' | bash
     echo "### test env_parallel with pipefail + inherit_errexit"

testsuite/wanted-results/parallel-local-0.3s

@@ -555,6 +555,15 @@ par_parcat_args_stdin	OK2
 par_parcat_rm	bug #51691: parcat --rm remove fifo when opened
 par_parcat_rm	OK1
 par_parcat_rm	OK file removed
+par_pct	### Test {%...} {%%...} {#...} {##...}
+par_pct	z.foo
+par_pct	z.foo
+par_pct	foo
+par_pct	foo
+par_pct	foo.z
+par_pct	foo.z
+par_pct	foo
+par_pct	foo
 par_perlexpr_with_newline	Perl expression spanning 2 lines
 par_pipe_N1_regexp	bug #55131: --regexp --recstart hangs
 par_pipe_N1_regexp	These should give the same

testsuite/wanted-results/parallel-local18

@@ -40,5 +40,5 @@ par_space_quote	a  \'"b 4
 par_special_char	a'   * ? >o  <i*? ][\!#¤%=( ) | }b 5
 par_special_char	a'   * ? >o  <i*? ][\!#¤%=( ) | }b 5
 par_special_char	a'   * ? >o  <i*? ][\!#¤%=( ) | }b 5
-par_special_char	a'   * ? >o  <i*? ][!#¤%=( ) | }b 5
+par_special_char	a'   * ? >o  <i*? ][\!#¤%=( ) | }b 5
 par_special_char	a'   * ? >o  <i*? ][\!#¤%=( ) | }b 5

testsuite/wanted-results/parallel-tutorial

@@ -1285,4 +1285,4 @@ mentioned in the release notes of next version of GNU Parallel.
 echo A
 echo B
 echo C
-7
+8