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Full Discussion: What does this command do? and how to decode all other lines
Top Forums UNIX for Dummies Questions & Answers What does this command do? and how to decode all other lines Post 302965095 by Aia on Saturday 23rd of January 2016 03:57:08 PM
Old 01-23-2016
Quote:
Code:
eval "$(dd if=$0 bs=1 skip=69 2>/dev/null|gpg -d 2>/dev/null)"; exit

dd reads from if=$0 one block size of 1 at a time bs=1 starting at the 70th block (skipping 69 characters). $0 is the script name of itself from where this command is issued. It outputs to stdout. The block skipped at the begging is the eval statement.

Take a look at how many characters long that line is, including the newline that it would be in the file.
Code:
echo 'eval "$(dd if=$0 bs=1 skip=69 2>/dev/null|gpg -d 2>/dev/null)"; exit' | wc -c

Code:
69

2>/dev/null is there to not pollute the stdout with the content that is piped to gpg:
gpg -d with the -d flag is to decrypt. In this case, it is not doing it from a filename but from stdin piped from the stdout of dd.
Again, 2>/dev/null will prevent pollution from any warning or status update that it will produce, essentially, disregarding those.
 

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LEARN ABOUT SUSE

gpg-zip

GPG-ZIP(1)							 GNU Privacy Guard							GPG-ZIP(1)

NAME

       gpg-zip - Encrypt or sign files into an archive

SYNOPSIS

       gpg-zip [options] filename1 [ filename2, ... ] directory1 [ directory2, ... ]

DESCRIPTION

       gpg-zip encrypts or signs files into an archive.  It is an gpg-ized tar using the same format as used by PGP's PGP Zip.

OPTIONS

       gpg-zip understands these options:

       --encrypt

       -e     Encrypt data.  This option may be combined with --symmetric (for	output that may be decrypted via a secret key or a passphrase).

       --decrypt

       -d     Decrypt data.

       --symmetric

       -c     Encrypt  with  a	symmetric  cipher  using  a  passphrase.   The	default symmetric cipher used is CAST5, but may be chosen with the
	      --cipher-algo option to gpg.

       --sign

       -s     Make a signature.  See gpg.

       --recipient user

       -r user
	      Encrypt for user id user. See gpg.

       --local-user user

       -u user
	      Use user as the key to sign with.  See gpg.

       --list-archive
	      List the contents of the specified archive.

       --output file

       -o file
	      Write output to specified file file.

       --gpg gpgcmd
	      Use the specified command gpgcmd instead of gpg.

       --gpg-args args
	      Pass the specified options to gpg.

       --tar tarcmd
	      Use the specified command tarcmd instead of tar.

       --tar-args args
	      Pass the specified options to tar.

       --version
	      Print version of the program and exit.

       --help Display a brief help page and exit.

EXAMPLES

       Encrypt the contents of directory 'mydocs' for user Bob to file 'test1':

	 gpg-zip --encrypt --output test1 --gpg-args  -r Bob mydocs

       List the contents of archive 'test1':

	 gpg-zip --list-archive test1

DIAGNOSTICS

       The program returns 0 if everything was fine, 1 otherwise.

SEE ALSO

       gpg(1), tar(1),

       The full documentation for this tool is maintained as a Texinfo manual.	If GnuPG and the info program are properly installed at your site,
       the command

	 info gnupg

       should give you access to the complete manual including a menu structure and an index.

GnuPG 2.0.15							    2010-07-05								GPG-ZIP(1)
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