Unix Tip: ELIMINATING MULTIPLE SPACES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3046 - June 9, 2009

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ELIMINATING MULTIPLE SPACES

Here is a simple script which helps in eliminating multiple spaces when one wants to extract a particular column in a set of records from a file.

Here is an example to prove the same:

ps -u $LOGNAME | tr -s " " : | cut -d: -f<column #>

The above script line can be used to extract a column from the output of a ps command for a particular user ($LOGNAME).

This tip generously supported by: arunkv@lucent.com

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Unix Tip: FINDING PCI DEVICES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3045 - June 8, 2009

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FINDING PCI DEVICES

Want to get information on PCI devices on your Linux or FreeBSD machine?

On Linux use:

/sbin/lspci (-v is verbose)

On FreeBSD use:

pciconf -l

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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: HANGING TIME ON HPUX

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3044 - June 7, 2009

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HANGING TIME ON HPUX

How can we change the time zone on a HP-UX machine ??

Answer : -Edit the entry in /etc/src.sh and /etc/src.csh, and reboot

This tip generously supported by: anil_sedha@mumbai.tcs.co.in

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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: FINDING MAC ADDRESS ON HP

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3043 - June 6, 2009

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

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FINDING MAC ADDRESS ON HP

If you want to know the MAC or eathernet address of your lan card on an HP-UX machine, then type:

lanscan

This will give you the mac addresses of all the lan cards installed on the machine.

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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: WHY MV IS SLOW

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3041 - June 4, 2009

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WHY MV IS SLOW

mv command across filesystems is slower on large files

WHY?

mv would be slow if you are moving files across filesystem.

The inode number changes only when a file is moved across file system.

A new inode number means a new file is physically created on disk.

It remains unchanged, if it is within the same filesystem. One can verify by using ls -il command on that file.

mv uses rename() system call. if it fails, it uses copy routine (basicailly reads from a file and writes in another file).

mv command across filesystem is more of a copy then mv.

This tip generously supported by: dkotian1@rediffmail.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: IRIX: CHECK FOR NEW CONFIGS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 2919 - February 2, 2009

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IRIX: CHECK FOR NEW CONFIGS

SGI loves to try and simplify your life with chkconfig switches to toggle various services on and off. After each upgrade, DOUBLE check the chkconfig switches. If something doesn't work all of the sudden check here.

For instance, tape drives in IRIX are disabled by a default install. To enable a tape subsystem:

# chkconfig ts on

# /etc/init.d/ts start

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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: OPERATING ON MULTIPLE FILES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 2918 - February 1, 2009

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OPERATING ON MULTIPLE FILES

Have you ever felt the need to perform a set of operations on multiple files simultaneously???

Here is a solution for that.

For instance, if it is required to perform multiple operations like searching a string (using grep), and executing an awk or perl script etc, etc. on not just one file but a set of files, use the following commands at the unix prompt:

$<: foreach i (<file_list>)
? echo $i
? grep <search_pattern> $i > tmp
? awk -f awk_script tmp >> report
? ....
? ....
? end
$<:

The files list in the brackets can be either

* Specifically mentioned

* A unix variable which contains a list of file names. For instance, the variable "p" can be assigned all the files starting with string "data" as follows:
set p = (data*)
Other examples are:
set g = `grep -l "Startpoint" * `
or
set all = *
(This assigns all file names in the current directory to the variable "all" )

And its usage with the "foreach" command will be as follows:

$<: foreach i ($all)
.....
.....
end

This tip generously supported by: lakshmi@virtualipgroup.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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