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Top Forums UNIX for Advanced & Expert Users How to decrypt a file in UNIX? Post 302847973 by hergp on Wednesday 28th of August 2013 07:28:32 AM
Old 08-28-2013
Quote:
Originally Posted by bakunin
...provided that the file is not longer than the maximum line length.
If you look closely, you'll find, that the working string S will never be longer than the longest line of the input file plus 63. The script adds one line to S and then writes 64 character portions to the output file until S is shorter than 64 characters.

The easiest way would be to use the base64 utility from the GNU coreutils, because it does not care about the proper 64-character-linelength, but it is not available everywhere.
 

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WC(1)								   User Commands							     WC(1)

NAME
wc - print newline, word, and byte counts for each file SYNOPSIS
wc [OPTION]... [FILE]... wc [OPTION]... --files0-from=F DESCRIPTION
Print newline, word, and byte counts for each FILE, and a total line if more than one FILE is specified. With no FILE, or when FILE is -, read standard input. A word is a non-zero-length sequence of characters delimited by white space. The options below may be used to select which counts are printed, always in the following order: newline, word, character, byte, maximum line length. -c, --bytes print the byte counts -m, --chars print the character counts -l, --lines print the newline counts --files0-from=F read input from the files specified by NUL-terminated names in file F; If F is - then read names from standard input -L, --max-line-length print the length of the longest line -w, --words print the word counts --help display this help and exit --version output version information and exit AUTHOR
Written by Paul Rubin and David MacKenzie. REPORTING BUGS
Report wc bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report wc translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for wc is maintained as a Texinfo manual. If the info and wc programs are properly installed at your site, the com- mand info coreutils 'wc invocation' should give you access to the complete manual. GNU coreutils 8.12.197-032bb September 2011 WC(1)
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