Question

I have started writing a small piece of code to print all the list of users available in the linux box. But I want to pass one by one user into my command to display each user details together.

to list all users

root@bt# getent passwd | grep /home/ | cut -d ':' -f 1

root
san
postgres

Now I want to pass one by user in to the below command to display each user details together.

root@bt# chage -l ${user1} ; chage -l ${user2} etcc.

should I need to user for loop or while loop here?
can any one help me in suggesting how to write the same?

Answer 1

You can use the while loop:

getent passwd | grep /home/ | cut -d ':' -f 1 | \
  while read user ; do
    chage -l "$user"
  done

or the for loop:

for user in $(getent passwd | grep /home/ | cut -d ':' -f 1) ; do
    chage -l "$user"
done

or xargs:

getent passwd | grep /home/ | cut -d ':' -f 1 | \
  xargs -n1 chage -l