Unix Tip: RECREATING DIRECTORY TREES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3498 - September 7, 2010

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RECREATING DIRECTORY TREES

This problem frequently
occurs. There is a machine
with a complex directory
structure, and you want to
have a copy of this directory
tree on another machine.

It is for testing purposes
(for example), and you want
to copy permissions,
UID/GID, and the directory
tree but don't want to copy
user files.

Here is the fastest
solution:
machine_a # cd /mydir
machine_a # find . -depth -print | cpio -o -O /tmp/dir.cpio

Copy the dir.cpio to
another machine.

machine_b # mkdir /mydir ; cd /mydir
machine_b # cat /tmp/dir.cpio | cpio -id

This tip generously supported by: paul@dataware.hu

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Unix Tip: DID IT REBOOT?

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3497 - September 6, 2010

http://www.ugu.com/sui/ugu/show?tip.today

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DID IT REBOOT?

If you believe your users
like to reboot their systems,
here is a way you will be
able to detect it.

#!/bin/ksh
#
# Boot Notification Script
# /etc/rc2.d/S99notify - Sends e-mail notification to the
administrators
# when the system is booted.
#

#*****************************************************************

PATH=/usr/sbin:/usr/bin

DATE="`date`"

SRVNM=`uname -n`

# The next variable can be set for multiple addresses
# (i.e. jsmith@yahoo.com,jsmith@hotmail.com)
MAILADD=monitor

mail $MAILADD <<EOF
From: $0
To: $MAILADD
Subject: Boot of $SRVNM

$DATE

$SRVNM has booted up.

If this is news to you, please investigate.

EOF

exit 0

This tip generously supported by: gideon@infostruct.net
Pal Szabo (System Engineer - T Systems Dataware)

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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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Unix Tip: TERMINAL RESET

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3496 - September 5, 2010

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TERMINAL RESET

To reset your terminal after
accidently opening a binary
file you can use the
following command:

# tput sgr0

This is supported on Solaris.
I haven't verified on other
SVR4 flavors.

This tip generously supported by: chris.penland@sbs.siemens.com

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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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Unix Tip: RENICE CPU HOGS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3495 - September 4, 2010

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RENICE CPU HOGS

have you ever wanted to
automatically force a
process that uses up
most of the CPU.

renice 20 `ps -augxww | sort -rn +3 -4 | head -1 | awk '{print $2}'`

Note: Check your 'ps'
command. Your arguments
may differ.

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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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Unix Tip: NICE NOT SO NICE

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3494 - September 3, 2010

http://www.ugu.com/sui/ugu/show?tip.today

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NICE NOT SO NICE

Nice is nice, but it
isn't so nice sometimes
on foreground jobs.

The reason, if the system
gets really busy your
terminal session could hang
waiting to get more CPU
time.

It is possible that killing
the job becomes impossible
on a very system, since
the CPU may never give the
process enough CPU time to
recognize the kill signal
waiting.

Using nice on an interactive
program, like vi, could
also be a bad idea.

So play nice, with nice.

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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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Unix Tip: STAT FOR THE INODE

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3493 - September 2, 2010

http://www.ugu.com/sui/ugu/show?tip.today

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STAT FOR THE INODE

The stat command is available
on newer flavors of Unix and
linux to provide inode
information about a file.

% stat /etc/hosts

File: "/etc/hosts"
Size: 1348 Filetype: Regular File
Mode: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Device: 3,2 Inode: 294992 Links: 1
Access: Tue Aug 21 15:06:19 2001(00000.00:00:00)
Modify: Wed Aug 30 09:19:35 2000(00356.05:46:44)
Change: Wed Aug 30 09:19:35 2000(00356.05:46:44)

It also provides other useful
information about files.

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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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Unix Tip: DEMO TO MULTIPLE TERMINALS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3492 - September 1, 2010

http://www.ugu.com/sui/ugu/show?tip.today

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DEMO TO MULTIPLE TERMINALS

Ever want to show multiple
people what you are doing in
a shell.

In the shell doing the demo
type:

% csh -i |& tee /tmp/demo
or
$ csh -i 2>&1 | tee /tmp/demo

In the other shells that are
going to watch the demo type:

% tail -f /tmp/demo

That's it!

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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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