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Full Discussion: Need to replace one string, in a file, with another string from a different file ...
Top Forums Shell Programming and Scripting Need to replace one string, in a file, with another string from a different file ... Post 302352759 by Praveen_218 on Sunday 13th of September 2009 08:53:58 AM
Old 09-13-2009
Need to replace one string, in a file, with another string from a different file ...
Hi,
I have a requirement to extract a variable string (say S1) from a given file (say File-A), and look for a certain pattern to find another string (say S2) in another file (say File-B) and replace S2 with S1.

An example could be:
You have got two password shadow files -
1) shadow1
2) shadow2

These files are colon (":") seperated fields (like any "/etc/shadow" file has).
I now need to look for a user (say 'David'); user entry is the first field in both the shadow files (both of the shadow files are having multiple users along with the user 'David') and replace the second field in the shadow files (which is the actual encrypted password string) of file 'shadow1' with the corressponding field in file 'shadow2' for the user 'David.

Password strings could be of any lengths and may contain all kinds of possible characters.

An example of AWK/gawk script would be the most desired on which can be embedded/called from a bash script.

However any method of solving this problem using Linux bash will do well for me.

Thank you very much in advance.
Last edited by Praveen_218; 09-13-2009 at 10:01 AM..
 

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LEARN ABOUT PLAN9

pwconv

pwconv(1M)						  System Administration Commands						pwconv(1M)

NAME

       pwconv - installs and updates /etc/shadow with information from /etc/passwd

SYNOPSIS

       pwconv

DESCRIPTION

       The pwconv command creates and updates /etc/shadow with information from /etc/passwd.

       pwconv relies on a special value of 'x' in the password field of /etc/passwd. This value of 'x' indicates that the password for the user is
       already in /etc/shadow and should not be modified.

       If the /etc/shadow file does not exist, this command will create /etc/shadow with  information  from  /etc/passwd.  The	command  populates
       /etc/shadow  with  the  user's  login  name,  password,	and  password  aging  information. If password aging information does not exist in
       /etc/passwd for a given user, none will be added to  /etc/shadow. However, the last changed information will always be updated.

       If the  /etc/shadow file does exist, the following tasks will be performed:

		Entries that are in the  /etc/passwd file and not in the /etc/shadow file will be added to the /etc/shadow file.

		Entries that are in the  /etc/shadow file and not in the /etc/passwd file will be removed from /etc/shadow.

		Password attributes (for example, password and aging information)  that exist in an /etc/passwd entry will be moved to the  corre-
		sponding entry in  /etc/shadow.

       The pwconv command can only be used by the super-user.

FILES

       /etc/opasswd

       /etc/oshadow

       /etc/passwd

       /etc/shadow

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       passwd(1), passmgmt(1M), usermod(1M), passwd(4), attributes(5)

DIAGNOSTICS

       pwconv exits with one of the following values:

       0	SUCCESS.

       1	Permission denied.

       2	Invalid command syntax.

       3	Unexpected failure.  Conversion not done.

       4	Unexpected failure.  Password file(s) missing.

       5	Password file(s) busy.	Try again later.

       6	Bad entry in /etc/shadow file.

SunOS 5.10							    9 Mar 1993								pwconv(1M)
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