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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3536 - October 14, 2012
http://www.ugu.com/sui/ugu/show?tip.today
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MULTIPLE SYSTEM FILE UPDATES
This Tip will show one of the ways to update
multiple systems with one script unattended:
There are a variety of ways to accomplish this,
but this one requires NO update to the remote
systems except for the files you wish to update
(i.e. - no update to .rhosts or hosts.equiv
type files). I use an ftp macro as follows:
------------------------------- CUT HERE ---------------------------
#!/bin/ksh
#
# program: update-all-workstations
# purpose: To ensure that all workstations have the same update of
# specific programs.
#
# notes: We run a ping command also to see if host is alive
# before we try to do the updates.
#
hosts=`ypcat hosts | grep col[d-f] | awk '{print $2}'`
for host in $hosts
do
alive=`ping -v $host 1 | awk '{print $3}'`
if [ $alive = "alive" ];
then
echo $host >> live-hosts
else
echo $host >> dead-hosts
fi
done
# This next sequence is totally unneeded if all workstations have a .rhosts
# file that allows the server (or system running this script) root access.
# If .rhosts is used, eliminate the prompting for the password and the
# building of the .netrc file.
#
# This next line assumes that ALL workstations have the same password
# If this is not the case, then administration becomes somewhat more
# cumbersome. Move the following 2 lines down to below the next do statement
# if the password differs from workstation to workstation.
echo "Please enter the root password for the workstations:\c"
read password
for host in `cat live-hosts`
do
echo "machine $host login root password $password" > $HOME/.netrc
chmod 600 $HOME/.netrc
echo "macdef init" >> $HOME/.netrc
echo "prompt" >> $HOME/.netrc
echo "binary" >> $HOME/.netrc
echo "put /tmp/myfiles.tar /tmp/myfiles.tar" >> $HOME/.netrc
echo "close" >> $HOME/.netrc
echo "quit" >> $HOME/.netrc
echo "\n\n" >> $HOME/.netrc
# these next few steps may seem redundant, but they are necessary.
# if you are using a .netrc file, it must be whacked after the ftp and
# before the rexec command
rm $HOME/.netrc
echo "machine $host login root password $password" > $HOME/.netrc
chmod 600 $HOME/.netrc
rexec $host "cd /usr/local; tar xvf /tmp/myfiles.tar"
done
# End of this script
#################################################################
Now, if you are using .rhosts files, the whole process becomes much
simpler.
Lets examine a script would look like if we are using .rhosts files on
each
workstation to allow the server or UNIX admin workstation to have root
access.
---------------------------- CUT HERE -----------------------------
#!/bin/ksh
#
# program: update-using-rhosts
# purpose: To ensure that all workstations have the same update of
# specific programs.
#
# notes: We run a ping command also to see if host is alive
# before we try to do the updates.
#
hosts=`ypcat hosts | grep col[d-f] | awk '{print $2}'`
for host in $hosts
do
alive=`ping -v $host 1 | awk '{print $3}'`
if [ $alive = "alive" ];
then
echo $host >> live-hosts
else
echo $host >> dead-hosts
fi
done
for host in `cat live-hosts`
do
# first we do a tar archive to standard out, then pipe to rsh to the
# host, make # sure we are in the root directory, then tar extract from
# standard in
tar cvf - ./usr/local/bin | rsh $host "cd /; tar xvf -"
done
# End of this script
Obviously the second method is easier, but obviously it depends on your
site characteristics on which you would use.
If you need assistance with these types of scripts, I will assist you,
but keep in mind, I accept no responsibility for anything that
happens to you or your site due to the use of these scripts.
Only an experienced admin should attempt to use these scripts, and
you should always have the appropriate safety precautions in
place.
James A. (Jamie) Dennis james.a.dennis@ameritech.net
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
Minggu, 14 Oktober 2012
Sabtu, 13 Oktober 2012
Unix Tip: REWIND A TAPE FAST
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3535 - October 13, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
REWIND A TAPE FAST
What's the fastest way to rewind a tape without
using "mt" or other tape software?
From a bourne or korn shell, Just type:
$ < /dev/[tapedevice]
$ < /dev/rst8
and watch it rewind...
This tip generously supported by: ulli@ucrc.org
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3535 - October 13, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
REWIND A TAPE FAST
What's the fastest way to rewind a tape without
using "mt" or other tape software?
From a bourne or korn shell, Just type:
$ < /dev/[tapedevice]
$ < /dev/rst8
and watch it rewind...
This tip generously supported by: ulli@ucrc.org
--------------------------------------------------------------------------
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
Jumat, 12 Oktober 2012
Unix Tip: CRYPT AN ASCII FILE
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3534 - October 12, 2012
http://www.ugu.com/sui/ugu/show?tip.today
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CRYPT AN ASCII FILE
An ascii file can be easily encrypted and
decrypted.
To encrypt simply pipe the STDOUT of
the file to "crypt" and redirect it to
a new file name. Enter a passowrd when
prompted with "Enter key".
$ cat foo | crypt > foo.e
Enter key:
To unencrypt simply pipe the STDOUT of
the encrypted file to "crpyt" and
redirect it to a new file name. Enter
a passowrd when prompted with
"Enter key".
$ cat foo.e | crypt > foo.new
Enter key:
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3534 - October 12, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
CRYPT AN ASCII FILE
An ascii file can be easily encrypted and
decrypted.
To encrypt simply pipe the STDOUT of
the file to "crypt" and redirect it to
a new file name. Enter a passowrd when
prompted with "Enter key".
$ cat foo | crypt > foo.e
Enter key:
To unencrypt simply pipe the STDOUT of
the encrypted file to "crpyt" and
redirect it to a new file name. Enter
a passowrd when prompted with
"Enter key".
$ cat foo.e | crypt > foo.new
Enter key:
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
Kamis, 11 Oktober 2012
Unix Tip: MORE AND VI OR MORE VI
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3533 - October 11, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
MORE AND VI OR MORE VI
To edit a file after looking at it with "more"
Press the letter "v" key and you will be placed
in a vi session.
Quitting the vi session will bring you back
to viewing the file with the "more" command
This will not work with piping a file to "more".
This works:
$ more /etc/hosts
This does not:
$ cat /etc/hosts | more
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3533 - October 11, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
MORE AND VI OR MORE VI
To edit a file after looking at it with "more"
Press the letter "v" key and you will be placed
in a vi session.
Quitting the vi session will bring you back
to viewing the file with the "more" command
This will not work with piping a file to "more".
This works:
$ more /etc/hosts
This does not:
$ cat /etc/hosts | more
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
Rabu, 10 Oktober 2012
Unix Tip: EXTRACT CORRUPTED TAR FILE
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3532 - October 10, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
EXTRACT CORRUPTED TAR FILE
In many case if there is a corrupted tar file,
the following command can be used in an attempt
to extract the file:
% cat [tar-filename] | tar -xvf -
NOTE: Where "-" is the STDOUT
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3532 - October 10, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
EXTRACT CORRUPTED TAR FILE
In many case if there is a corrupted tar file,
the following command can be used in an attempt
to extract the file:
% cat [tar-filename] | tar -xvf -
NOTE: Where "-" is the STDOUT
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
Selasa, 09 Oktober 2012
Unix Tip: EDIT A LOST FILE
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3531 - October 9, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
EDIT A LOST FILE
Forget where you put your files?
Rather than specifying an absolute pathname,
use command substitution instead.
Instead of:
% vi /usr/local/bin/foo
Try:
% vi `which foo`
NOTE: files must be in your path for "which" to find them.
This tip generously supported by: thockin@ais.net
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3531 - October 9, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
EDIT A LOST FILE
Forget where you put your files?
Rather than specifying an absolute pathname,
use command substitution instead.
Instead of:
% vi /usr/local/bin/foo
Try:
% vi `which foo`
NOTE: files must be in your path for "which" to find them.
This tip generously supported by: thockin@ais.net
--------------------------------------------------------------------------
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
Senin, 08 Oktober 2012
Unix Tip: COLLECTING FILES
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UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3530 - October 8, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
COLLECTING FILES
NOTE: Depending on how the command is used, an
admin with root can abuse their privileges.
If there are similar files on a system and you wish
to collect the contents of those files (possibly
for security reasons) the following command
will search a system for a filename and output
the contents into a file to be viewed.
# find / -name .rhosts -perm -004 -print > rhosts 2>e &
Another use was brought up that one could
learn what other commands users use. They
may have thought of some tricks you may not have:
# find / -name .bash_history -perm -004 -print >o 2>e &
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 3530 - October 8, 2012
http://www.ugu.com/sui/ugu/show?tip.today
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
COLLECTING FILES
NOTE: Depending on how the command is used, an
admin with root can abuse their privileges.
If there are similar files on a system and you wish
to collect the contents of those files (possibly
for security reasons) the following command
will search a system for a filename and output
the contents into a file to be viewed.
# find / -name .rhosts -perm -004 -print > rhosts 2>e &
Another use was brought up that one could
learn what other commands users use. They
may have thought of some tricks you may not have:
# find / -name .bash_history -perm -004 -print >o 2>e &
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==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.
Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================
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