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find: Limiting Command Size

 
 3.3.2.4 Limiting Command Size
 .............................
 
 'xargs' gives you control over how many arguments it passes to the
 command each time it executes it.  By default, it uses up to 'ARG_MAX' -
 2k, or 128k, whichever is smaller, characters per command.  It uses as
 many lines and arguments as fit within that limit.  The following
 options modify those values.
 
 '--no-run-if-empty'
 '-r'
      If the standard input does not contain any nonblanks, do not run
      the command.  By default, the command is run once even if there is
      no input.  This option is a GNU extension.
 
 '--max-lines[=MAX-LINES]'
 '-L MAX-LINES'
 '-l[MAX-LINES]'
      Use at most MAX-LINES nonblank input lines per command line;
      MAX-LINES defaults to 1 if omitted; omitting the argument is not
      allowed in the case of the '-L' option.  Trailing blanks cause an
      input line to be logically continued on the next input line, for
      the purpose of counting the lines.  Implies '-x'.  The preferred
      name for this option is '-L' as this is specified by POSIX.
 
 '--max-args=MAX-ARGS'
 '-n MAX-ARGS'
      Use at most MAX-ARGS arguments per command line.  Fewer than
      MAX-ARGS arguments will be used if the size (see the '-s' option)
      is exceeded, unless the '-x' option is given, in which case 'xargs'
      will exit.
 
 '--max-chars=MAX-CHARS'
 '-s MAX-CHARS'
      Use at most MAX-CHARS characters per command line, including the
      command initial arguments and the terminating nulls at the ends of
      the argument strings.  If you specify a value for this option which
      is too large or small, a warning message is printed and the
      appropriate upper or lower limit is used instead.  You can use
      '--show-limits' option to understand the command-line limits
      applying to 'xargs' and how this is affected by any other options.
      The POSIX limits shown when you do this have already been adjusted
      to take into account the size of your environment variables.
 
      The largest allowed value is system-dependent, and is calculated as
      the argument length limit for exec, less the size of your
      environment, less 2048 bytes of headroom.  If this value is more
      than 128KiB, 128Kib is used as the default value; otherwise, the
      default value is the maximum.
 

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