Category: Redhat Enterprise Linux 6

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‘od’: Write files in octal or other formats

‘od’ writes an unambiguous representation of each FILE (‘-‘ means standard input), or standard input if none are given.  Synopses:      od [OPTION]… [FILE]…      od [-abcdfilosx]… [FILE] [[+]OFFSET[.][b]]      od [OPTION]… –traditional [FILE] [[+]OFFSET[.][b] [[+]LABEL[.][b]]] Each line of output consists of the offset in the...

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Linux Admin Reference – Device Mapper Multipath ( DM-Multipath) Configuration – Red Hat Enterprise Linux 6

In Enterprise Linux Environment, External storage often permits devices to be accessed by multiple physical paths. This improves redundancy and availability. SAN environment Red Hat Enterprise Linux provides the device-mapper-multipath component to manage multipath capable storage and to present multipath devices to applications running on the...

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‘csplit’: Split a file into context-determined pieces

‘csplit’ creates zero or more output files containing sections of INPUT (standard input if INPUT is ‘-‘).  Synopsis:      csplit [OPTION]… INPUT PATTERN… The contents of the output files are determined by the PATTERN arguments as detailed below.  An error occurs if a PATTERN argument refers...

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‘md5sum’: Print or check MD5 digests

‘md5sum’ computes a 128-bit checksum (or “fingerprint” or “message-digest”) for each specified FILE. Note: The MD5 digest is more reliable than a simple CRC (provided by the ‘cksum’ command) for detecting accidental file corruption, as the  chances of accidentally having two files with identical MD5 are...

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How to add Linux hosts to Nagios server for monitoring

Nagios is free and open source application that is used for monitoring the complete It infrastructure i.e. computers, firewalls, printers, networks etc. It provides real time updates of usage of various resources like ram, hdd or cpu usage of the systems & also provides alerts when...

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