Unix and Linux Tips

Senin, 07 Juni 2010

Unix Tip: HANGING TIME ON HPUX

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3044 - June 7, 2010

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

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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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Minggu, 06 Juni 2010

Unix Tip: FINDING MAC ADDRESS ON HP

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UNIX HOT TIP

Unix Tip 3043 - June 6, 2010

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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.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Sabtu, 05 Juni 2010

Unix Tip: MAX FILES UNDER LINUX

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3042 - June 5, 2010

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

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MAX FILES UNDER LINUX

Maximum number of files that one process can have open at one time can be find out by using:

getconf OPEN_MAX

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Jumat, 04 Juni 2010

Unix Tip: WHY MV IS SLOW

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UNIX HOT TIP

Unix Tip 3041 - June 4, 2010

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

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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

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Kamis, 03 Juni 2010

Unix Tip: ECHO LINES TO A BLANK

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3040 - June 3, 2010

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ECHO LINES TO A BLANK

To echo all lines in a file upto the first blank line use the following:

awk '$0 ~ /^$/ {exit;} {print $0;}' <file_name>

The awk script can be used for printing lines upto the first occurence of any pattern.

Just substitute ^$ with the pattern.

I wrote this script to parse http server headers.

This tip generously supported by: anand@anandraman.net

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Rabu, 02 Juni 2010

Unix Tip: STAT FILES

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3039 - June 2, 2010

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STAT FILES

Not supported on all flavors.

To see inode contents (file size, allocated blocks, file type, user, group, file mode, last accessed, last modified etc) of a file:

$ stat file1 file2 fileN

This tip generously supported by: sachin_m_joshi@yahoo.com

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
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Selasa, 01 Juni 2010

Unix Tip: AWK THE STATS

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UNIX HOT TIP

Unix Tip 3038 - June 1, 2010

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AWK THE STATS

AWK script for getting statistics.

The script gives the statistics of the default shell set for the users.

i.e. Number of users using csh,ksh or sh

$cat stat_demo.awk
#start here
BEGIN{
FS=":"
#seperator is set to :
}
{
#$7, is 7 field in passwd file
stat_array[$7]=stat_array[$7]+1;
}
END{
print "Login-Shell Count" ;
for (i in stat_array) print i, stat_array[i]
#Displays statistics
}