Dealing with a large active log
When the log size gets to say 1GB we want to back it up in another directory and empty the current log file.
Therefore basically we are doing:
cp SystemOut.log <some dir with large space> cat /dev/null > SystemOut.log
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To view System Resource Information uname –help uname -r grep model /proc/cpuinfo grep MemFree /proc/meminfo sudo -u root lastcomm -f /var/account/pacct cat /proc/version # cat /proc/cpuinfo # cat /proc/meminfo # cat /proc/zoneinfo # cat /proc/mounts cat /etc/redhat-release grep MemTotal /proc/meminfo grep SwapTotal /proc/meminfo df -k /tmp grep “model name” /proc/cpuinfo ifconfig (/sbin/ifconfig) uaname -r lshal:detected […] Monitor Your System Performance in Linux
@server ~]# uptime 13:14:02 up 1:30, 2 users, load average: 0.04, 0.26, 0.27 [root@server ~]# ps -eo %u | sort | uniq -c | sort -rn [root@server ~]# sar -c ## Process/sec Linux 2.6.18-164.el5 (server.scratch.com) 08/24/2011 11:50:01 AM proc/s 12:00:01 PM 6.87 12:10:01 PM 6.90 12:20:01 PM 7.10 […]
Reestablish Volume Group To tap into the volume group you wish to work with, make sure /etc/lvm/lvm.conf filters are able to see the /dev/md? devices, and execute the following: [tempsrv] # vgscan Reading all physical volumes. This may take a while… Found volume group “rootvg” using metadata type lvm2
which should display the […] Search and replace recursively on a directory in Linux ere is the small bash shell script to make life simple… This script can do a search for string and replace with a new string recursively in a directory. ——————————————————————————– #!/bin/bash # This script will search and replace all regular files for a string # supplied […] To list the directory sizes in kilo bytes and largest at the top du -sk * | sort +0nr du -sk * | sort -nr To list the directory sizes in Mega bytes and largest at the top du -sm * | sort +0nr du -sm * | sort -nr To list the directory […] Linux / UNIX will not allow you to unmount a device that is busy. There are many reasons for this (such as program accessing partition or open file) , but the most important one is to prevent data loss. To find out the processes which are active on the partition. [root@tempsrv ~]# lsof | grep […] RPM Packages installation and usage RPM Packages installation and usage Note: Normal querying doesnot require a root loogin but for installation and uninstalling a package you need to be logged in as root. We can also use regular expressions or wiild-characters with the rpm command. RPM PACKAGE INSTALLATION/ UNINSTALLATION: # installing a rpm package with […] About umask umask command will be used for setting the default file creation permissions. When a file is created, its permissions are set by default depending on the umask setting. This value is usually set for all users in /etc/profile and can be obtained by typing: # umask The default umask value is usually 022. […] n addition to the basic permissions discussed above, there are also three bits of information defined for files in Linux: * SUID or setuid: change user ID on execution. If setuid bit is set, when the file will be executed by a user, the process will have the same rights as the owner of the […] |
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