Cfrtjryk

I'm supposed to write a script that outputs local users real name and their password expiration information.

This is what I have at the moment. any help would be appreciated.

$ cat /etc/passwd | grep '/home' | cut -d: -f5 ;chage -l {} | 

    fgrep "Password expires"'| column -t

A better way to get local users might be to see if the user has a valid login shell:

getent passwd | grep -f /etc/shells

Here's something that should work:

getent passwd | grep -f /etc/shells | tr ',' ':' | 

    awk -F: '{print $1, $5}' | while read USER NAME 

    do 

        echo $NAME:$(chage -l $USER| awk -F': ' '/Password expires/{print $2}')

    done | column -ts: 

Using xargs, one can do:

getent passwd | grep -f /etc/shells | tr ',' ':' | awk -F: '{print $1, $5}' | 

    xargs -L1 bash -c 'echo ${@:2}:$(chage -l $1| awk -F": " "/Password expires/{print $2}")' : | 

    column -ts: 

• Using tr to replace the , with : lets us lift the full name from the GECOS field directly.


• 
  column can be given an input delimiter with -s, which lets us keep multi-word names in one column.


• 
  -L makes xargs use one line of input per command, so that the username and full name are passed to each command.


• 
  ${@:2} - all the parameters from the second parameter onwards (skipping the first).

Example output:

root                      never

Murukesh Mohanan          never

Guest                     never

You can use xargs to iterate through the results like this:

$ grep '/home' /etc/passwd | cut -d: -f1 | xargs -n1 -I{} chage -l {} | 

    grep "Password expires" | column -t

Password  expires  :  never

In this variation we're calling xargs with the -n1 switch so it'll only call chage -l with a single username argument. The -I{} tells xargs to use {} as a macro so that we can mark where we want it to put the arguments when calling chage.

cut -d: -f1,3,5 /etc/passwd | while IFS=: read -r user userid fullname

do

    if [ "$userid" -gt 500 ];

    then

    echo "Full Name: $fullname"

    echo "Password Expiry date: $(chage -l "$user" | head -2 | tail -1)"

    fi

done

I am just adding the extra step on checking for the local users as /etc/passwd file normally contains the system users as well which we do not want. Also, I am using a while loop to iterate over the file for better readability.