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# files: file access utilities
read verbs take a right argument of a filename, optionally linked with one or two numbers (as for 1!:11): 0 = start of read (may be negative) 1 = length of read (default rest of file) write verbs return number of characters written. filenames may be open or boxed character strings. string verbs write out text delimited with the host OS delimiter, and read in text delimited by LF. on error, the result is 1, e.g. for file not found/file read error/file write error
Name | Type | Description
fappend | verb | append text to file
fappends | verb | append string to file
fcopynew | verb | copies files if changed
fcopynews | verb | copies files as strings if changed
fdir | verb | file directory
ferase | verb | erases a file
fexist | verb | test if a file exists
fread | verb | read file
freadr | verb | read records from flat file
freads | verb | read file as string
freplace | verb | replace text in file
fselect | verb | file selection dialog
fsize | verb | return file size
fss | verb | file string search
fssrplc | verb | file string search and replace
fstamp | verb | returns file timestamp
fview | verb | view file
fwrite | verb | write text to file
fwrites | verb | write string to file
fappend
    append text to file
    	The text is first ravelled. The file is created if necessary.
    Returns number of characters written, or an error message.
    form: text fappend filename
    example:
      'chatham' fappend 'newfile.txt'
    7
fappends
    append string to file
    The text is first ravelled into a vector with each row
    terminated by the CRLF pair. Any single LF or CR characters
    in the text are converted into the CRLF pair.
    The file is created if necessary. Returns number of characters
    written, or an error message.
fcopynew
    copies files if changed
    form: tofile fcopynew fromfiles
    returns: 0, size    not changed
             1, size    changed
             _1         failure
fcopynews
    copies files as strings if changed
    form: tofile fcopynews fromfiles
    returns: 0, size    not changed
             1, size    changed
             _1         failure
fdir
    file directory
    example:
      fdir jpath '~system\main\s*.ijs'
ferase
    erases a file
    Returns 1 if successful, otherwise _1
fexist
    test if a file exists
    Returns 1 if the file exists, otherwise 0.
fread
    read file
    y. is filename {;start size}
    x. is optional:
       = b    read as boxed vector
       = m    read as matrix
       = s    read as string (same as freads)
freadr
    read records from flat file
    y. is filename {;record start, # of records}
    records are assumed of fixed length delimited by
    one (only) of CR, LF, or CRLF.
    the result is a matrix of records.
freads
    read file as string
    y. is filename {;start size}
    x. is optional (b and m same as fread):
       = b    read as boxed vector
       = m    read as matrix
    freads
freplace
    replace text in file
    form: dat freplace file;pos
fselect
    file selection dialog
    y. = DOS filespec or ''
    x. = optional file type list
    returns user selection
fsize
    return file size
    returns file size or _1 if error
fss
    file string search
    form: str fss file
    search file for string, returning indices
fssrplc
    file string search and replace
    form: (old;new) fssrplc file
fview
    view file
    uses standard Windows edit control,
    which is limited to around 20K size.
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