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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 OPENSOLARIS

gpg-error

gpg-error(1)							   User Commands						      gpg-error(1)

NAME

       gpg-error - Get the description for specified error numbers.

SYNOPSIS

       gpg-error errorno [...]

DESCRIPTION

       gpg-error is a tool that returns the description of specified error numbers.

OPERANDS

       The following operands are supported:

       errorno	Error numbers for which you want to get the description.

EXIT STATUS

       The following exit values are returned:

       0	Application exited successfully

       1	Application exited with failure

FILES

       The following files are used by this application:

       /usr/bin/gpg-error      Executable for gpg-error

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgpg-error		   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Volatile			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gpg-error-config(1), libgpg-error(3), attributes(5)

       Written by Jeff Cai, Sun Microsystems Inc., 2008.

SunOS 5.11							    31 Jul 2008 						      gpg-error(1)
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