March 16, 2010

Extract the contents of an RPM

Linux General,

Using rpm2cpio command, the contents of an RPM package can be extracted without having to install the package. For source RPMs too this command can be used. This is illustrated...

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March 13, 2010

Difference between Buffer and Cache

Linux General,

Buffers are allocated by various processes to use as input queues, etc. Most of the time, buffers are some processes' output, and they are file buffers. A simplistic explanation of...

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March 13, 2010

Memory Usage in Linux

Linux General,

Check the memory usage on a linux system with the command given below. The free command helps in getting the memory usage in the system [rams@stopprepare-lx ~]$ free -m total...

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March 13, 2010

Disable the Error Beep in MySQL

Linux General,

To temporarily disable the beep, pass --no-beep along when logging into the server: %>mysql -u root -p --no-beep To permanently disable this annoyance, add no-beep to the [client] section of...

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March 13, 2010

How FreeBSD identifies hard disks and drives

Linux General,

FreeBSD identifies various types of hard disks and drives with following naming convention ad ATAPI (IDE) disk da SCSI direct access disk acd ATAPI (IDE) CDROM cd SCSI CDROM fd...

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March 13, 2010

Attach words horizontally using shell scripting

Linux General,

To paste contents of two files horizontally, paste command can be used. Create a file called cmd with the following content: # cat cmd /usr/sbin/useradd /usr/sbin/useradd /usr/sbin/useradd Create another file...

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March 13, 2010

Find empty files in Linux

Linux General,

find command provides two options to detect empty files $ find . -size 0c or $ find . -empty To find and delete all the empty files under the current...

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March 13, 2010

Capture top command output in a file

Linux General,

Capture top command output in a file The output of top command can be captured as follows top -b -n1 > /tmp/top1.txt This will run top command once and write...

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January 29, 2010

Difference between grep and egrep

Linux General,

Difference between grep and egrep egrep is extended grep which includes additional regular expression metacharacters like ?, +, () and | Eg: egrep "(People|sense)" values.txt This command searches for patterns...

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January 1, 2010

Create directory & set permission using a single Linux command

Linux General,Linux/Windows Support,

Generaly, we create directory using "mkdir" command and then change it's permissions using "chmod" command. Create directory & set permission using a single Linux command Actually, we can set the...

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