caesar(6) [netbsd man page]

CAESAR(6)							 BSD Games Manual							 CAESAR(6)

NAME

     caesar, rot13 -- decrypt caesar ciphers

SYNOPSIS

     caesar [rotation]

DESCRIPTION

     The caesar utility attempts to decrypt caesar ciphers using English letter frequency statistics.  caesar reads from the standard input and
     writes to the standard output.

     The optional numerical argument rotation may be used to specify a specific rotation value.

     The frequency (from most common to least) of English letters is as follows:

	   ETAONRISHDLFCMUGPYWBVKXJQZ

     Their frequencies as a percentage are as follows:

	   E(13), T(10.5), A(8.1), O(7.9), N(7.1), R(6.8), I(6.3), S(6.1), H(5.2), D(3.8), L(3.4), F(2.9), C(2.7), M(2.5), U(2.4),  G(2),  P(1.9),
	   Y(1.9), W(1.5), B(1.4), V(.9), K(.4), X(.15), J(.13), Q(.11), Z(.07).

     Rotated postings to USENET and some of the databases used by the fortune(6) program are rotated by 13 characters.

BSD
								 November 16, 1993							       BSD

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

NAME

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

SYNOPSIS

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

DESCRIPTION

     Strfile reads a file containing groups of lines separated by a line containing a single percent '%' sign and creates a data file which con-
     tains 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 source_file.out.

     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 refer-
	      enced.  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 cypher.  This option causes
	      the STR_ROTATED bit in the header str_flags field to be set.

     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 network 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.

SEE ALSO

     byteorder(3), fortune(6)

FILES

     strfile.out  default output file.

HISTORY

     The strfile utility first appeared in 4.4BSD.

4th Berkeley Distribution					   June 9, 1993 					 4th Berkeley Distribution