Hi,

After posted many requests on how to remove user from a group, i choosed
to build my own script.
And it works very fine.

if [ $1 ] & [ $2 ]; then
cp /etc/group /tmp
cat /tmp/group | grep ^$2 > /tmp/onlygroup
cat /tmp/group | grep -v ^$2 > /tmp/nogroup
cat /tmp/onlygroup | sed "s/$1//g" | \
        sed "s/ /,/g" | sed "s/,,/,/g" | sed "s/,$//g" > /tmp/newgroup
cat /tmp/newgroup >> /tmp/nogroup
cat /dev/null > /tmp/group
cat /tmp/nogroup >> /tmp/group
cp /tmp/group /etc
chmod 644 /etc/group
chown root /etc/group
chgrp wheel /etc/group
rm -f /tmp/*
echo "Success."
else
echo "Remove user from a group"
echo "Use : sh duig user group"
fi

Cheers,

Wesley MOUEDINE ASSABY
www.mouedine.net 

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I'm getting a case of nausea here.

	-Otto

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You really deserve the Useless Use of Cat Award.
And the race condition award, and the nuke the wrong file award, and...

Kind regards,
   Markus

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Tomas already pointed out where this will blow up for sure.

Hint: Take a look at mktemp(1) and install(1) to weed out the worst 
issues.

Kind regards,
   Markus

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... did'nt know there were such many tools,thanks.

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On Tue, Dec 14, 2010 at 12:31 PM, OpenBSD Geek <openbsd@e-solutions.re>

very "secure" step when you have some temporary files from daemons

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Among other hilariously horrible things,

You just nuked everybody's tempfiles.

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Ok! Here goes my contribution to this thread!

# $1=group
# $2=user

cd /etc
cat ./group \
        | sed '/'$1'/ s/'$2'//' \
        | sed '/'$1'/ s/,,/,/' \
        | sed '/'$1'/ s/,$//' \
        | sed '/'$1'/ s/:,/:/' > group.new

mv /etc/group.new /etc/group
chown root.wheel /etc/group
chmod 644 /etc/group
exit 0



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On Tue, Dec 14, 2010 at 4:00 PM, Leonardo Rodrigues

A) root:wheel is better.
B) it's a bad idea to fix the permissions of a file after installing it.

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On Tue, Dec 14, 2010 at 10:00 PM, Leonardo Rodrigues

My take ;)

# -------------------------
FILE=/etc/group
FILE=group

install ${FILE} ${FILE}.orig

sed -e "/$1/s/$2//" \
    -e "/$1/s/,,/,/" \
    -e "/$1/s/,$//" \
    -e "/$1/s/:,/:/"   ${FILE}.orig > ${FILE}

# ----------------------------

Adriaan

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Hm, that's a nice one too: for every line in /etc/group that contains '$1',

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This must be the most horrible thread ever in terms of scripting and
sh/ksh (ab)use I've ever seen.

Please, folks, don't consider using anything posted in this thread, or
god will start killing kittens.



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