Commits on Jan 31, 2024

1. xargs exits on empty line from stdin …

   * BSD versions of xargs don't support the -l option
   * Standards document for xargs mentions -L but not -l [1]
   * Follow GNU version and accept -l as an alias for -L, but list standard -L in usage string
   * Behaviour of -L/-l didn't match xargs on my linux system: input loop was terminated on
     first empty line of STDIN
   * Skipping empty lines makes the behaviour match GNU version
   
   1. https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/utilities/xargs.html
   
   %cat -n in # not all lines have content
        1	#!/usr/bin/perl
        2	
        3	=begin metadata
        4	
        5	Name: awk
        6	Description: pattern-directed scanning and processing language
        7	Author: Tom Christiansen, tchrist@perl.com
        8	Author: Larry Wall, larry@wall.org
        9	License: perl
       10	
   
   %xargs -L 1 < in # implicit 'echo' for each line of stdin
   #!/usr/bin/perl
   =begin metadata
   Name: awk
   Description: pattern-directed scanning and processing language
   Author: Tom Christiansen, tchrist@perl.com
   Author: Larry Wall, larry@wall.org
   License: perl
   
   %perl xargs -L 1 < in # patched version
   #!/usr/bin/perl
   =begin metadata
   Name: awk
   Description: pattern-directed scanning and processing language
   Author: Tom Christiansen, tchrist@perl.com
   Author: Larry Wall, larry@wall.org
   License: perl

   

   mknos authored Jan 31, 2024
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