topic Ch. 11 Shell Script Needed in Operating System - HP-UX

Ch. 11 Shell Script Needed

Andre Harvey — Wed, 26 May 2004 09:33:29 GMT

I'm studying the "HP Certified: HPUX System Administration" book and the answer to the review question #6 in Ch. 11 is missing. It sounds simple but I'm new and need some help. The question reads as follows:

Previously all users were using the Bourne shell. The administration has changed the policy and now everyone is asked to use the POSIX shell. Write a program that changes the shell of all users from /usr/bin/old/sh to /usr/bin/sh.

Re: Ch. 11 Shell Script Needed

Mark Grant — Wed, 26 May 2004 09:42:37 GMT

sed "s/\/usr\/bin\/old\/sh/\/usr\/bin\/sh/" /etc/passwd > /etc/passwd.new && mv /etc/passwd.new /etc/passwd

Looks like it will work!

Re: Ch. 11 Shell Script Needed

Andre Harvey — Wed, 26 May 2004 09:55:24 GMT

Thanks!

Re: Ch. 11 Shell Script Needed

Thork — Wed, 26 May 2004 10:03:39 GMT

Dear Scott,

If I understand you, you need a routing that replace in the passwd file the string â /usr/bin/old/shâ to â /usr/bin/shâ . Try whit this one:

for i in `cat /etc/passwd`
do
echo $i | awk '{ sub("/usr/bin/old/sh","usr/bin/sh"); print $0 }' >> /tmp/newpasswd
done

this routing dosenâ t work if the lines in the file has bl

Re: Ch. 11 Shell Script Needed

Manish Srivastava — Wed, 26 May 2004 10:05:38 GMT

Hi,

I agree with Mark only one more addition:

sed "s/\/usr\/bin\/old\/sh$/\/usr\/bin\/sh/" /etc/passwd > /etc/passwd.new && mv /etc/passwd.new /etc/passwd

add the "$" after the \/usr\/bin\/old\/sh$ to make sure that only the last item of each entry is changed.

manish.

Re: Ch. 11 Shell Script Needed

RAC_1 — Wed, 26 May 2004 10:09:13 GMT

for i in `cut -d : -f1`
do
/usr/sbin/usermod -s /usr/bin/sh $i
done

Anil

Re: Ch. 11 Shell Script Needed

RAC_1 — Wed, 26 May 2004 10:11:16 GMT

Typo in my earlier post.

cp /etc/passwd /etc/passwd.bak
for i in `cut -d : -f1 /etc/passwd`
do
/usr/sbin/usermod -s /usr/bin/sh $i
done

Anil