Run a self-defined command on many files in a directory tree on the Windows, Mac OS X and Linux command line with a free open source tool.

sfk run "your command $file [$relfile] [...]" [-yes] [-nohead] [-quiet] [...]

run a self-defined command on every file- or directory name.
within your command string, you may specify:

   $file                     - insert full filename, including path.
   $quotfile    or $qfile    - just as $file, but with quotes "" around.
   $relfile     or $qrelfile - insert relative filename, without path.
   $base        or $qbase    - the relative base filename, without extension.
   $ext         or $qext     - filename extension. has extension .txt.
   $path        or $qpath    - the path (directory) without filename.
   $relpath     or $qrelpath - sub path relative to start folder.
   $ufile       or $upath    - force unix style slashes "/" on output.
   $qufile      or $qupath   - unix slashes and quotes combined.
   $since       or $qsince   - with option -sincediff: the reference file name.
   $text        or $qtext    - one record of input text, similar to $file.
   $targ        or $qtarg    - with -tomake: target filename.

   always prefer 'q' forms over non-quoted forms: as soon as there is a filename
   containing blanks, e.g. X:\the src files\test one.txt, you will need quotations,
   or you have to manually insert \" or \q escaped quotes (see 3rd example below).
   you may also use $quotrelfile, $quotsince, $quottext for greater clarity.
   if you supply only $path expressions, only directories will be processed.
   on single word chain commands like "+run vi", " $qfile" is added automatically.

further pattern support:
   -spat       activates slash patterns like \t \q \xnn etc.
   -upat       unix style syntax using # instead of $

   -yes        really execute. default is just to simulate what would be done.
               you may also type run. (with a dot) as quick confirmation.
   -nohead     does not display the [simulating:] info text.
   -noinfo     unless you use $text, sfk checks the input filenames
               1. if they contain blanks, but no quotes are given within command.
               2. if they seem to use the wrong path separator character.
               in both cases, a reminder is printed. if you know that your command
               needs no changes, add -noinfo or use $text instead of $file.
   -quiet      does not echo the commands before execution.
   -relnames   strips the root directory names from filenames.
   -i[files]   process a text or filename list from stdin.
   -idirs      process a directory name list from stdin.
               on stdin, '#' remark lines and empty lines are skipped. note:
               "sfk.exe <list.txt" supports only 4 KB for list.txt under windows.
               "type list.txt | sfk.exe" supports unlimited stream length.
   -nofile[names]   with chaining, does not create ":file " name records.
   -printcmd   print the full command which is executed to console.
   -stoprc=n   stop processing if a command returns return code >= n.

command string format
   with option -spat, slashpatterns like \t \q \xnn are supported.
   due to syntax limitations of the command shell, it may help
   - to use \q instead of \"   (avoids quote miscounting at shell)
   - to use \x26 instead of &  (if ampersand is behaving unexpected)

quoted variable expansion
   when using sfk variables which contain filenames, like in
      run "copy #(src) #(dst)"
   then spaces in filenames require enquoting. when using -spat
   and \q it may cause conflicts if the filename itself contains
   known slash patterns, like \t in file 'mydir\thebar.txt'.
   to avoid this you can use (with sfk run only):
      run "copy #(qsrc) #(qdst)"
   which will surround variable contents by double quotes.

quoted multi line parameters are supported in scripts
   using parm trim. type "sfk script" for details.

temporary or permanent output files
   if run output is post-processed by command chaining, e.g. run ... +filter,
   sfk creates temporary files to collect the output. by default, these files
   are deleted when run finishes. say "sfk help options" for more on this.
   specify -to targetdir\$file to write command output into a permanent
   target fileset. required directories are created automatically.
   -to accepts the same mask as run itself, e.g. -to "mydir\$path\$base.tmp"
   by default, standard output AND standard error stream are written to file.
   add 2>nul to your command to strip the error stream.

return code by variable
   sfk variable run.lastrc contains the return code of the external
   program called. if multiple files were processed then it contains
   only the rc of the last file.

command chaining notes
   sfk run "...$path..." +nextcmd: will pass directories, not filenames.
   sfk run ... -to tmp\$file +nextcmd: will pass output filenames, not input.
   sfk run ... +run: will pass unchanged input filename list.

see also
   sfk perline  run sfk command(s) per text input line.
   sfk runloop  run commands using a loop counter.

web reference

   sfk run "attrib -R $qfile" -quiet testfiles\FooBank\BarDriver
      removes readonly attribute on all files within BarDriver
   sfk run "<img src=$quottext>" -dir . -file .jpg -nohead >index.html
      create html-style image list of all jpegs (using just simulation).
      note that option -nohead removes the [simulating:] info text lines.
   type dirlist.txt | sfk run -idirs "xcopy \"x:\$path\" \"z:\$path\" /I /D"
      update-copy all directories from dirlist.txt from x: to z:
   sfk run "diff oldsrc\$file newsrc\$file" -relnames -sincediff oldsrc newsrc
      compare directories, run "diff" on all files with different content.
   sfk run "diff $qsince $qfile" -sincediff oldsrc newsrc
      same as above, only shorter and safer (including quotes around filenames).
   sfk run "zip $qfile" -since 20070131 . .java .jsp
      collect .java and .jsp files added/changed since 31-Jan-2007 into a zip file.
   sfk list testfiles .txt +run vi
      open all .txt files in vi. $qfile is added automatically.
   sfk sel . .avi +run "ffmpeg -i $file -f image -t .02 thumbs\$base-%d.jpg"
      extract first image from all .avi movies, videos using ffmpeg.
   sfk sel -since 30m . .cpp .hpp +run -printcmd "rm $path/$base.o"
      delete all object files of source codes changed in the last 30 minutes
   sfk echo -lines 100 101 102 +run "showstatus.bat $text"
      run showstatus.bat three times with the given numbers, e.g. local ip's.
   sfk sel soundlib .wav -tomake "outdir\$base.mp3"
    +run "ffmpeg -i $qfile $qtarg"
      for all .wav files within soundlib that have no, or an older, .mp3 file
      within outdir, run command ffmpeg to convert from .wav to .mp3.
   sfk -exectime run. "copy in.dat out.dat"
      measure the time it takes to run a copy command.
   sfk -var run "myprog.exe" -yes +tell "myprog rc: #(run.lastrc)"
      run external program myprog.exe and tell it's return code.

Don't try to execute a full run statement in ONE GO. Almost certainly, something
will go wrong (wrong files selected, syntax error in the command itself), and you
end up with many wrong output files. Instead, use THREE STEPS:

1. find the correct file set, by some trial and error:
      sfk run "echo $quotfile" mydir
   This will simply show all filenames from "mydir". no command is executed
   on those files, so nothing bad is happening. almost certainly, you notice
   that too many files are included. Maybe you have to add "-nosub" to exclude
   subfolders, or add more details about your file selection, like:
      sfk run "echo $quotfile" mydir .jpg .jpeg
   which reduces the file set to just .jpg and .jpeg files within "mydir".

2. Replace "echo" by the actual command, still running in simulation mode.
      sfk run "copy $quotfile \"d:\pic\small_$base.jpg\"" mydir .jpg .jpeg
   This simulates a copy of all images from mydir to d:\pic, prefixing their name
   by "small_", and ensuring that all target file extensions are only ".jpg".

3. When you're satisfied with the simulation output, add "-yes".

 Another example: list the methods of all .class files in a directory tree.

    This time, we take a different approach, starting with "sfk list".
    To list all .class files in the directory tree "pack", we say:
       sfk list pack .class

    This may result in an output like this:
    Our goal is to turn these lines into commands of the form:
       javap pack.classname

    So how do we achieve this? First, we have to change the format of the
    output lines, through adding a "filter" command:
       sfk list pack .class +filter -rep /\/./ -rep /.class//

    This replaces all slashes "\" by a dot ".", and strips off the ".class".
    Now the resulting output is:
    Finally, we pipe this into "run":

    sfk list pack .class +filt -rep /\/./ -rep /.class// +run "javap $file"

    The resulting output - a simulated preview - is now:
       javap "pack.Lemon"
       javap "pack.Curry"
       javap "pack.Yet"
       javap "pack.Another"
       javap "pack.One"
 Finally, run the command again, this time adding "-yes":

 sfk list pack .class +filt -rep /\/./ -rep /.class// +run "javap $file" -yes

 Which will result in the interface listings of all classes.