Execute many sfk commands in a script file: sfk script

sfk [f]script [opts] file [-from=label] [parm1] [parm2] [...]

execute sfk command(s) from a script file, which can be
 - an absolute filename, e.g. C:\scripts\thescript.txt
 - a relative filename. in this case, the file is searched
   in the current dir "." first, and then in the PATH.

parameters:
 - if "-from=label" is given, the script file is searched
   for a statement "label mylabel", and script execution runs
   from this point until +end is reached.

 - all other words after -from, or instead of from, are passed
   as parameters to the script, with one exception:
   a word starting with a "+" continues the sfk command chain.
   if you need to pass words starting with "+" to the script,
   set option -literal (disallowing further chain commands).

command chaining:
   with ...  +script name, text data is passed to the script.
   with ... +fscript name, filenames are passed to the script.

script file syntax:
   - lines having // as first text are ignored.
   - command line parameters 1 to 9 can be addressed both
     by expressions %1 to %9, or $1 to $9.
   - character # at column 1 of any line is skipped, which
     allows bash-embedded scripts to have sfk statements
     outcommented if necessary.
   - escaped quotes \" are changed into normal quotes "
   - line ends are ignored. in general, lines are combined
     into one large command chain, just like typing them all
     into one line of unlimited length.
   - any whitespace is skipped unless surrounded by quotes "
     however this may or may not apply with the following:

about quoted multi line parameters:
  a command in a script like

    +echo "
          Help chapter 01
          ---------------
          The quick brown fox
          "

  gets one large parameter spread across multiple lines,
  called a quoted multi line parameter. this contains
  many whitespaces at line starts, and invisible end of
  line characters at line ends, which often cause commands
  like echo, run or (x)replace not to work as expected.

  - add option -qtrim after "sfk label labelnam" to have
    whitespaces reduced automatically depending on command.
    this is default since SFK 1.8.0.
    sfk will auto apply one of these trimming modes:

    full trim  : all whitespace and eol are dropped.
                 -> used with most commands

    parm trim  : single blank is left between words.
                 -> used with run

    auto indent: some blanks and eol are kept to keep
                 an indentation relative to 1st line.
                 -> used with echo

  - add option -qraw  after "sfk label labelnam" to keep
    all whitespace as it is. this is no longer default
    since SFK 1.8.0, and may be required with old scripts.
    you may also set SFK_CONFIG=qraw

  also type "sfk label" for infos.

parameter name collisions:
  if your script contains commands like
      +filter -form "$10.10col1 ..."
  then "$1" will be misinterpreted as an input parameter
  into the script. to avoid this use one of
      +filter -form "$(10.10col1) ..."
  or  +filter -form "$$10.10col1 ..."
  or disable $ as a parameter name prefix
  by option -prefix. see "sfk label" for more on that.

options
   -verbose  tell in detail which words are used from script.
   -literal  also pass words to the script that start with "+".

see also
    sfk help chain  command chaining overview
    sfk help var    about script parameters and variables
    sfk label       further options given after label
    sfk load        load text or data for chaining

setting global options for all commands within a script:
   supply them directly after "sfk" of the calling command:
   sfk -var script myscript.txt -from=mylabel
      runs myscript.txt with sfk variable support
      active in every command.
   some options like -var can also be given after sfk label.
   see "sfk label" for more.

for script examples, type:
   sfk samp sfk       - create sfk sample script
   sfk samp sfkbat    - sample script embedded in windows batch
   sfk samp sfkbash   - sample script embedded in bash script
   sfk samp           - more about the sfk sample syntax

more in the SFK Book
   the SFK Book contains a 60 page tutorial, including
   long script examples with input, output and explanations.
   type "sfk book" for details.

web reference
   http://stahlworks.com/sfk-script

recommended use:
   if you want to create an easy-to-use script on the fly,
   1. create an embedded script in a batch file:
      sfk batch myscript.bat
   2. edit myscript.bat with any text editor.
   3. run the script by typing "myscript.bat".