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| 4 | btoa(LOCAL) UNIX Programmer's Manual btoa(LOCAL) |
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| 7 | |
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| 8 | NAME |
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| 9 | btoa, atob, tarmail, untarmail - encode/decode binary to |
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| 10 | printable ASCII |
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| 11 | |
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| 12 | SYNOPSIS |
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| 13 | btoa < inbinary > outtext |
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| 14 | |
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| 15 | atob < intext > outbinary |
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| 16 | |
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| 17 | tarmail who subject files ... |
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| 18 | |
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| 19 | DESCRIPTION |
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| 20 | _b_t_o_a is a filter that reads anything from the standard |
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| 21 | input, and encodes it into printable ASCII on the standard |
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| 22 | output. It also attaches checksum information used by the |
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| 23 | reverse filter "atob" to check integrity. atob gives NO |
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| 24 | output (and exits with an error message) if its input is |
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| 25 | garbage or the checksums do not check. |
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| 26 | |
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| 27 | tarmail ralph here-it-is-ralph foo.c a.out |
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| 28 | |
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| 29 | _t_a_r_m_a_i_l is a shell that tar's up all the given files, pipes |
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| 30 | them through btoa, and mails them to the given person with |
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| 31 | the given subject phrase. "tarmail" with no args will print |
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| 32 | a short message reminding you what the required args are. |
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| 33 | When the mail is received at the other end, that person |
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| 34 | should use mail to save the message in some temporary file |
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| 35 | name (say "xx"). Then saying "untarmail xx" will decode the |
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| 36 | message and untar it. By using tarmail, binary files and |
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| 37 | entire directory structures can be easily transmitted |
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| 38 | between machines. Naturally, you should understand what tar |
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| 39 | itself does before you use tarmail. |
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| 40 | |
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| 41 | Other uses: |
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| 42 | |
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| 43 | crypt < secrets | btoa | mail ralph |
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| 44 | |
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| 45 | will mail the encrypted contents of the file "secrets" to |
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| 46 | ralph. If ralph knows the encryption key, he can decode it |
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| 47 | by saving the mail (say in "xx"), and then running: |
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| 48 | |
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| 49 | atob < xx | crypt |
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| 50 | |
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| 51 | (crypt requests the key from the terminal, and the "secrets" |
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| 52 | come out on the terminal). |
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| 53 | |
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| 54 | FILES |
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| 55 | /usr/local/bin: the programs |
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| 56 | |
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| 57 | AUTHOR |
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| 58 | Paul Rutter |
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| 59 | |
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| 62 | |
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| 63 | Bell Version 7 1 |
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| 70 | btoa(LOCAL) UNIX Programmer's Manual btoa(LOCAL) |
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| 73 | |
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| 74 | FEATURES |
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| 75 | It uses a compact base-85 encoding so that 4 bytes are |
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| 76 | encoded into 5 characters. |
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| 77 | |
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| 78 | BUGS |
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| 79 | It uses an obscure base-85 "squoz code" scheme to encode 4 |
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| 80 | bytes into 5 characters. |
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| 129 | Bell Version 7 2 |
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