Unix and Linux Tips

Senin, 07 Februari 2011

Unix Tip: INSERT A LINE

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3286 - February 7, 2011

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

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INSERT A LINE

If you want to insert a line
at the top (or anywhere for that
matter) of a file within a shell
script, use the ed editor.

EXAMPLE:

string="hello"
ed << EOF
e any_file
1i
${string}

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Minggu, 06 Februari 2011

Unix Tip: FINDING CORE FILES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3285 - February 6, 2011

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

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FINDING CORE FILES

To find and remove core files
conditionally:

# find ~ -name core -exec file {} \; -exec rm -i {} \;

"file" will show which executable
the core file is for and the -i
option to rm will allow you to
choose weather to delete it or not.

#### EXAMPLE ##############

# find ~ -name core -exec file {} \; -exec rm -i {} \;

/my/home/core: ELF 32-bit LSB core file of 'netscape-commun'
(signal 3), Intel 8
rm: remove `/my/home/core'? y

This tip generously supported by: sparkman@webmd.net

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Sabtu, 05 Februari 2011

Unix Tip: IDENTIFY A PROCESSES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3284 - February 5, 2011

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

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IDENTIFY A PROCESSES

The command fuser is very
handy when you want to know
which processes or users
have a file open. Its basic
syntax is:

/etc/fuser -u /usr/my_application/foo

You must enter the file's full
path name, as shown above.

The fuser command is located
under the /etc directory on HP-UX,
AIX and SCO flavors. You must
login as root to use it.

Its output is a raw list of
processes id numbers and users login
names.

Please refer to your Unix man pages
to find more about this useful command.

This tip generously supported by: tinaco110@hotmail.com

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Jumat, 04 Februari 2011

Unix Tip: LOOK FOR A STRING

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3283 - February 4, 2011

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

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LOOK FOR A STRING

Sometimes you look for a string
in files on your directory using
grep, but you end up getting funny
characters on your terminal. This
is really annoyance, since sometimes
you have to reset your terminal if
you are using X. What you can do,
you can grep only those files that in
text by doing the following command:

grep "hello world" `find ./ -name "*" -print -exec file {} \; |
grep text | cut -d ':' -f 1`

Sure you have to change the "hello World"
to the string what you are looking for.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Kamis, 03 Februari 2011

Unix Tip: STOP ASKING QUESTIONS

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3282 - February 3, 2011

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

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STOP ASKING QUESTIONS

What's the best way to become a UNIX guru?
Learn UNIX.

There are two great resources available to
the UNIX programmer that give general help
and often examples. One is the "man" command.

ex. man vi
The other is the "-?" command line option.
ex. sort -?

These will tell you all you need to know
about most commands.

I suggest that newbies look at the following
man pages:

vi - probably the best text editor ever made
sh/ksh/csh - my favorite flavor is ksh
awk - fantastic!!
sed - dull but indispensable

Spend some time looking at the man pages.
At the end there is usually a list of related
commands, a great way to enhance your UNIX
vocabulary!

This tip generously supported by: jcolman@bigfoot.com

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Rabu, 02 Februari 2011

Unix Tip: DIR ALIAS REPRISE

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3281 - February 2, 2011

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

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DIR ALIAS REPRISE

The following alias will list just
the directories in a directory and
not other ordinary files. It will
list a directory as a directory even
if the directory is a symbolic link.

alias dir='ls -Lla|grep ^d'

Without the capital "L" in this alias
the alias will not list directories
that are symbolic links.

This tip generously supported by: eric_furman@hotmail.com

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