Unix and Linux Tips

Rabu, 18 Januari 2012

Unix Tip: RUN ON LAST SUNDAY

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3266 - January 18, 2012

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

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RUN ON LAST SUNDAY

If you want a job to run on the last
sunday of every month, you can use
the following syntax from within cron:

18 * * * 0 [`date "+%d"` -gt 24] && /path/to/script

i.e. on sundays at 18:00 check if
the day of the month is greater than
24 - if so run the job (if 23 is
specified the job will run on the last
2 sundays of the month)

NOTE: There back-ticks around the date
command, not single quotes.

This tip generously supported by: duncan.ferguson@egg.com

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Selasa, 17 Januari 2012

Unix Tip: SIMPLE MASK OVERLOOKED

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3265 - January 17, 2012

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

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SIMPLE MASK OVERLOOKED

Another way to CD to the long directory.

Works in both csh and ksh

cd too*

Will change to the directory "toobigtotype"
As long as there is only one ocurrance
of the word too....

This is great when there is only
one sub directory within a directory,
just use:

cd *

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Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Senin, 16 Januari 2012

Unix Tip: AUTO WORD COMPLETION

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3264 - January 16, 2012

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

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AUTO WORD COMPLETION

In tcsh, the TAB key will automatically
complete any name in the current
directory for any application (for pico,
cd, rm, chown)... It will even complete
paths from root.

Soo... If you want to open your .cshrc
from root you do..

"pico /ho"[TAB] -> "pico /home/"
Then continue with "yuo"[tab] -> "yourusername"
Then you get "pico /home/yourusername/"
And then type ".cs"[TAB] -> ".cshrc"
So in the end you get "pico /home/yourusername/.cshrc"
In a lot less stokes...

But say there are 2 users called
yourusername and yourothername.

Well, then the shell will beep, and if
you hit TAB again, you will get a listing
off all the files that start with "you".
You can then continue to the point where
the names differ, and then hit TAB.

This also works for commands.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Minggu, 15 Januari 2012

Unix Tip: CHANGE THE SUFFIX

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3263 - January 15, 2012

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

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CHANGE THE SUFFIX

If you want to change the suffix of
multiple files, you can't do:

% mv *.abc *.def

However the following shell script
can be used to do the required
opperation:

***

Change all *.abc file to *.def the
following shell script would work:

#!/bin/sh
for f in *.abc; do
mv $f `basename $f .abc`.def
done

How it works:

for f in *.abc; do

Set up a look for all files ending
in .abc, and each time around setup
$f as the filename

mv $f `basename $f.abc`.def

`basename $f .abc` takes the filename
in $f and removes any trailing occurences
of .abc, we then append .def to the result
and the resulting command becomes
"mv file.abc file.def"

done

Ends the "for" loop above.

Under "csh" or "tcsh" a similar thing could be done with:

foreach f in ( *.abc )
mv $f `basename $f .abc`.def
end

This tip generously supported by: pwain@liberate.com

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Sabtu, 14 Januari 2012

Unix Tip: DELETING BLANK LINES USING GREP

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3262 - January 14, 2012

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

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DELETING BLANK LINES USING GREP

For thos who are not familiar with
awk, but still want a quick and easy
way of removing blank lines from a
flat ascii file, remember that the
use of 'cat' in conjuction with
'grep' is just as effective.

cat file1 | grep -v '^$' >file2
mv -f file2 file1

This tip generously supported by: dave_tomkins@tands.co.uk

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