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Full Discussion: One more awk question!
Top Forums Shell Programming and Scripting One more awk question! Post 59086 by zazzybob on Thursday 9th of December 2004 10:21:55 AM
Old 12-09-2004
Okay, so let's say we have an input file, passwd, containing

Code:
Password="{3DES}someotherpass="
Properties="user=BAR
Password="{3DES}hhzJvUvg3X4="
Properties="user=BLAH
Password="{3DES}someotherpass="
Properties="user=FOO

And you want to change the password for user BLAH

Then, the following code
Code:
#!/bin/ksh
line=`grep -n "user=BLAH" passwd | awk -vFS=':' '{print $1}'`
((line=line-1))
awk -vl=$line '
{ if ( NR == l ) {
   sub( /{3DES}hhzJvUvg3X4=/, "mynewpass" )
  }
  { print }
}' passwd

Would print the (I assume) desired output of
Code:
Password="{3DES}someotherpass="
Properties="user=BAR
Password="mynewpass"
Properties="user=BLAH
Password="{3DES}someotherpass="
Properties="user=FOO

Is this what you want?

Cheers
ZB
 

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LEARN ABOUT POSIX

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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