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STRFILE(8)                BSD System Manager's Manual               STRFILE(8)

     strfile, unstr -- create a random access file for storing strings

     strfile [-iorsx] [-c char] source_file [output_file]
     unstr source_file

     strfile reads a file containing groups of lines separated by a line
     containing a single percent '%' sign and creates a data file which
     contains a header structure and a table of file offsets for each group of
     lines.  This allows random access of the strings.

     The output file, if not specified on the command line, is named

     The options are as follows:

     -c char  Change the delimiting character from the percent sign to char.

     -i       Ignore case when ordering the strings.

     -o       Order the strings in alphabetical order.  The offset table will
              be sorted in the alphabetical order of the groups of lines
              referenced.  Any initial non-alphanumeric characters are
              ignored.  This option causes the STR_ORDERED bit in the header
              str_flags field to be set.

     -r       Randomize access to the strings.  Entries in the offset table
              will be randomly ordered.  This option causes the STR_RANDOM bit
              in the header str_flags field to be set.

     -s       Run silently; don't give a summary message when finished.

     -x       Note that each alphabetic character in the groups of lines is
              rotated 13 positions in a simple caesar cipher.  This option
              causes the STR_ROTATED bit in the header str_flags field to be

     The format of the header is:

           #define VERSION 1
           unsigned long   str_version;    /* version number */
           unsigned long   str_numstr;     /* # of strings in the file */
           unsigned long   str_longlen;    /* length of longest string */
           unsigned long   str_shortlen;   /* length of shortest string */
           #define STR_RANDOM      0x1     /* randomized pointers */
           #define STR_ORDERED     0x2     /* ordered pointers */
           #define STR_ROTATED     0x4     /* rot-13'd text */
           unsigned long   str_flags;      /* bit field for flags */
           char str_delim;                 /* delimiting character */

     All fields are written in big-endian byte order.

     The purpose of unstr is to undo the work of strfile.  It prints out the
     strings contained in the file source_file in the order that they are
     listed in the header file source_file.dat to standard output.  It is
     possible to create sorted versions of input files by using -o when
     strfile is run and then using unstr to dump them out in the table order.

     strfile.dat  default output file.

     byteorder(3), fortune(6)

     The strfile utility first appeared in 4.4BSD.

BSD                            January 17, 2010                            BSD