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grep particular characters help

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# 1  
Old 08-06-2012
grep particular characters help
Hello folks i have file which is below, i want to extract last column of file that contains dm-21 or dm-13 or dm-N

Quote:

Aug 5 04:15:32 server kernel: ournald(4108): WRITE block 15661624 on dm-21
Aug 5 07:20:15 server kernel: <7(4108): WRITE block 315165328 on dm-21
Aug 5 07:20:15 server kernel: ck 315168240 on dm-21
Aug 5 07:20:15 server kernel: <d(4108): WRITE block 12050472 on dm-21
Aug 5 07:20:15 server kernel: d(4108): WRITE block 12050480 on dm-21
Aug 5 07:20:15 server kernel: <74108): WRITE block 12050504 on dm-21
Aug 5 07:20:15 server kernel: 8): WRITE block 316000544 on8): WRITE block 31600058): WRITE b8): WRITE bloc
k 316000568 on dm-21
Aug 5 07:20:15 server kernel: <8): WRITE block 316006424 on dm-21
Aug 5 07:20:15 server kernel: 8): WRITE block 316006432 on dm-21
Aug 5 07:20:15 server kernel: <74108): WRITE block 3160404108): WRITE block 316045440 4108): WRITE urnald(
4108): WRITE block 316049760 on dm-21
Aug 5 07:45:14 server kernel: <7E block 314216256 on dm-14
Aug 5 07:45:14 server kernel: <7E block 314216264 on dm-21E block 314216272 on dm-21
Aug 5 07:45:14 server kernel: E block 314216512 on dm-21
Aug 5 07:45:14 server kernel: <E block 314216576 on dm-21
Aug 5 07:45:14 server kernel: <E block 314216624 on dmE block 314216632 on dm-21
Aug 5 07:45:14 server kernel: <7(4108): WRITE block 314307720 on dm-18
it show output like

Quote:

dm-21
dm-7
dm-8
I have tried but i got this

Quote:
command

perl -lane 'print $F[-1]' /var/log/messages |grep -e "dm-*" > dm
Quote:
output

dm-4
dm-5
<dm-8
dm-8
<dm-8dm-8
dm-8dm-8
dm-9
<dm-dm-17
<dmdm-17
dm-dm-21
<dm-dm-8
dm-dm-8
Last edited by learnbash; 08-06-2012 at 12:09 PM..
# 2  
Old 08-06-2012
Code:
echo 'Aug 5 04:15:32 server kernel: ournald(4108): WRITE block 15661624 on dm-21' | sed 's/.*[ ]//'

# 3  
Old 08-06-2012
Code:
awk '$NF ~ /dm-[0-9]/{print $NF}' file

# 4  
Old 08-06-2012
Code:
perl -lane 'if($_=~/dm-21|dm-13|dm-N/){print $F[-1]}' /var/log/messages

# 5  
Old 08-06-2012
It is showing output like this

Quote:
output

dm-2<7><7>kjour
dm-2>kjourna
dm-30
dm-33
dm-4
dm-5
<dm-8
dm-8
<dm-8dm-8
dm-8dm-8
# 6  
Old 08-06-2012
It is showing output like this

which command you tried ?
# 7  
Old 08-06-2012
Quote:
Originally Posted by itkamaraj
Code:
perl -lane 'if($_=~/dm-21|dm-13|dm-N/){print $F[-1]}' /var/log/messages

Not working properly giving only. many characters are missing.

Quote:
output that is total incorrect

<7dm-13
<7dm-21
blocdm-21
ddm-21
<dm-13
dm-13
<dm-1dm-2dm-13
<dm-21
dm-21
dm-dm-21
<m-13dm-13
mdm-21
WRITaljournald(4108)dm-21
WRITE>kjournald(4108)dm-21


as i mentioned i need output like this

Quote:
output

dm-1
dm-2
dm-3
..
dm-11
dm-12
....
dm-22
dm-23
...
dm-33
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