Category Archives: Linux

sed change entire line

Posted on 8 June 2011 by Andrew Fraser

Here I use sed to replace the entire 2nd line in a lot of files with a new 2nd line. The shell script: for fle in `ls *.msg` do # copy file first so as can keep permissions and ownership … Continue reading →

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RAID internal hard disks linux

Posted on 6 June 2011 by Andrew Fraser

Useful commands to show RAID level of internal hard disks. On HP blade servers: /usr/sbin/hpacucli controller all show status /usr/sbin/hpacucli controller slot=0 logicaldrive all show On other servers: cat /proc/mdstat

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Cron during British Summer Time / Daylight Saving Time

Posted on 6 April 2011 by Andrew Fraser

For older versions of unix/linux, crons running at 01.* (anything from 01:00 to 01:59) do not run during the Spring Sunday time change. Those sames crons will run twice during the Autumn time change. So it is important to not … Continue reading →

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Check if you work on a virtual/physical machine in Linux

Posted on 14 February 2011 by Andrew Fraser

http://www.spotht.com/2010/11/check-if-you-work-on-virtualphysical.html

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FTP 421 service not available tcp wrapper hosts.allow

Posted on 6 January 2011 by Andrew Fraser

Files /etc/hosts.allow and /etc/hosts.deny control tcp wrapper permissions for incoming requests to linux servers. Ftp access is normally controlled by the ‘vsftpd’ line, e.g.: vsftpd: 138.134.116. 138.134.117. That would allow ftp connections from IP addresses like 138.134.116.x and 138.134.117.x. If … Continue reading →

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IBM Tivoli restores using dsmc

Posted on 23 December 2010 by Andrew Fraser

As root dsmc or, for more complex configurations, specify an optfile: dsmc -optfile=/opt/tivoli/tsm/client/ba/bin/dsm-ora.opt List backup files: tsm> q backup “/oracle/*” -subdir=yes -inactive Restore: tsm> restore “/oracle/mydb/*” /oracle/ -subdir=yes -pick Note how the second mention of directory path ommits the lowest … Continue reading →

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Server age with dmidecode|grep Date

Posted on 8 November 2010 by Andrew Fraser

BIOS build date should correspond to approximate manufacture date for a server, is given with (as root): dmidecode | egrep -i ‘date|product’

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Find delete old files

Posted on 29 October 2010 by Andrew Fraser

# Delete files older than 15 minutes find /ORA_DISK/redoarch/ -name ‘arch_*.dbf’ -mmin +15 -delete #Delete files older than 2 days 50 8 * * * find /ORA_DISK/redoarch/ -name ‘arch_*.dbf’ -mtime +2 -delete Old versions of unix find do not have … Continue reading →

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Tivoli Storage Manager simple restore

Posted on 28 October 2010 by Andrew Fraser

Sample restore from command line Tivoli Storage Manager. Run as root. ps -ef | grep dsm #here look to see if ‘optfile’ is set cd /mydir dsmc -optfile=/opt/tivoli/tsm/client/ba/bin/dsm-ora.opt tsm> restore /mydir/*.dbf -inactive -pick tsm> 1 #here choose which file number … Continue reading →

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du -sk to identify space usage unix

Posted on 8 April 2010 by Andrew Fraser

Find out what directories are using up disk space in unix with this command: du -sk * | sort -n I often put it into a function so I can call it quickly: g () { du -sk * | … Continue reading →

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