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STRFILE (8) | System administration commands and daemons | Unix Manual Pages | :man


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


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


The strfile utility 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 source_file .dat.

The options are as follows:

-C Flag the file as containing comments. This option cases the STR_COMMENTS bit in the header str_flags field to be set. Comments are designated by two delimiter characters at the beginning of the line, though strfile does not give any special treatment to comment lines.
-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; do not 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
uint32_t str_version; /* version number */
uint32_t str_numstr;/* # of strings in the file */
uint32_t str_longlen; /* length of longest string */
uint32_t str_shortlen; /* length of shortest string */
#define STR_RANDOM 0x1/* randomized pointers */
#define STR_ORDERED0x2/* ordered pointers */
#define STR_ROTATED0x4/* rot-13’d text */
#define STR_COMMENTS 0x8/* embedded comments */
uint32_t 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.


strfile.dat default output file.


byteorder(3), fortune(6)


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