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Full Discussion: [SHELL: /bin/sh] For loop using variable variable names
Top Forums Shell Programming and Scripting [SHELL: /bin/sh] For loop using variable variable names Post 302651899 by Vryali on Wednesday 6th of June 2012 10:24:56 AM
Old 06-06-2012
[SOLVED] [SHELL: /bin/sh] For loop using variable variable names
Simple enough problem I think, I just can't seem to get it right.

The below doesn't work as intended, it's just a function defined in a much larger script:
Code:
CheckValues() {
    for field in \
        Group_ID \
        Group_Title \
        Rule_ID \
        Rule_Severity \
        Rule_Version \
        Rule_Title \
        Rule_Fix_Text; do
        if [ ! -n \$${field} ]; then
            echo "Error, ${field} undefined."
        else
            echo "\$${field}"
        fi
    done
}

The else statement won't exist once I've successfully tested it. The output I see when I run the actual script is:

Code:
# ./GEN000290-1.sh
$Group_ID
$Group_Title
$Rule_ID
$Rule_Severity
$Rule_Version
$Rule_Title
$Rule_Fix_Text
GEN000290-1: Running CMD: grep -c '^games' /etc/passwd
0
Not a finding.
GEN000290-1: Not a finding.

What I expect to see in the above is the value of those variables (Which is just a string of text assuming non-zero length).

Code:
Group_ID='V-4269-1'
Group_Title='Unnecessary Accounts, Games.'
Rule_ID='SV-4269-lr4_rule'
Rule_Severity='CAT II'
Rule_Version='GEN000290-1'
Rule_Title='The system must not have the unnecessary "games" account.'
Rule_Fix_Text='Remove the "games" account from the /etc/password file before connecting a system to the network.'

Kindly note that I need it to be /bin/sh compliant, as it'll be going across multiple Linux/Unix platforms.
Last edited by Vryali; 06-06-2012 at 11:47 AM.. Reason: Clarity
 

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LEARN ABOUT DEBIAN

passwd

PASSWD(5)						   File Formats and Conversions 						 PASSWD(5)

NAME

       passwd - the password file

DESCRIPTION

       /etc/passwd contains one line for each user account, with seven fields delimited by colons (":"). These fields are:

       o   login name

       o   optional encrypted password

       o   numerical user ID

       o   numerical group ID

       o   user name or comment field

       o   user home directory

       o   optional user command interpreter

       The encrypted password field may be blank, in which case no password is required to authenticate as the specified login name. However, some
       applications which read the /etc/passwd file may decide not to permit any access at all if the password field is blank. If the password
       field is a lower-case "x", then the encrypted password is actually stored in the shadow(5) file instead; there must be a corresponding line
       in the /etc/shadow file, or else the user account is invalid. If the password field is any other string, then it will be treated as an
       encrypted password, as specified by crypt(3).

       The comment field is used by various system utilities, such as finger(1).

       The home directory field provides the name of the initial working directory. The login program uses this information to set the value of
       the $HOME environmental variable.

       The command interpreter field provides the name of the user's command language interpreter, or the name of the initial program to execute.
       The login program uses this information to set the value of the $SHELL environmental variable. If this field is empty, it defaults to the
       value /bin/sh.

FILES

       /etc/passwd
	   User account information.

       /etc/shadow
	   optional encrypted password file

       /etc/passwd-
	   Backup file for /etc/passwd.

	   Note that this file is used by the tools of the shadow toolsuite, but not by all user and password management tools.

SEE ALSO

       crypt(3), getent(1), getpwnam(3), login(1), passwd(1), pwck(8), pwconv(8), pwunconv(8), shadow(5), su(1), sulogin(8).

shadow-utils 4.1.5.1						    05/25/2012								 PASSWD(5)
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