Unix and Linux Tips

Jumat, 30 April 2010

Unix Tip: OUTPUT BETWEEN LINES

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UNIX GURU UNIVERSE UNIX HOT TIP

Unix Tip 3006 - April 30, 2010

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

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OUTPUT BETWEEN LINES

To print the contents between two lines in a file in UNIX :

sed -n 'from lineno , to lineno p' filename

i.e to print data from line 2 to 5 of 'text' file

sed -n '2,5p' text

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Kamis, 29 April 2010

Unix Tip: A VI FILE REVERSAL

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3005 - April 29, 2010

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

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A VI FILE REVERSAL

I know...Enough of the file reversals already. We just really like this one and forgot about it until it was submitted..

A file reversal if you dont have tac or want to use a script.

Edit the file in vi and type:
:g/.*/m0

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Rabu, 28 April 2010

Unix Tip: FINDING BLANK LINES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3004 - April 28, 2010

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

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FINDING BLANK LINES

How to find number of blank lines in a file use the following command:

cat filename |awk ' /^$/ { ++x } END ( print "No. of Blank Lines = " x } '

This tip generously supported by: deepak.singla@ehpt.com

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Selasa, 27 April 2010

Unix Tip: SUN LOGIN DENIED

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3003 - April 27, 2010

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

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SUN LOGIN DENIED

If the system is not allowing you to login as root or normal users, first check #eeprom from OS level or printenv from OK prompt.

check tpe-link-test?=true

If it is false, change it to true.

This tip generously supported by:
subramonian.murugan@adcc.alcatel.be

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Senin, 26 April 2010

Unix Tip: ENHANCED #1576 FILE REVERSAL

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3002 - April 26, 2010

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

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ENHANCED #1576 FILE REVERSAL

This is an enhancement to UNIX Tip #1576 - April 25, 2001.

The original tip is kind a cool, so I decided to enhance it.

I hope it's okay with the main author.

#!/bin/ksh
lns=`wc -l $1 | nawk '{ print $1 }`
{
cat $1 | awk '{ line[NR] = $0; }
{ for (i = NR; i > 0; --i) print line[i] }'
} >> $$.temp
tail -"$lns" $$.temp
rm $$.temp

This tip generously supported by: jena_m@hotmail.com

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FILE REVERSAL

For those that don't have
the tac command, to reverse
a file in UNIX, you could use:

cat <file-name> | awk '{ line[NR] = $0;} END
{for(i=NR;i>1;i--) print line[i] }'

This tip generously supported by: chandramohan_k@infy.com

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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