Category: Redhat Enterprise Linux 6

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Linux Admin Troubleshooting Reference – Kernel Panic and System Crash – Redhat Enterprise Linux (RHEL6)

What is the meaning of a Linux System Crash?   Crash is a generic term used usually to say that the system has come to halt and no progress is observed. The system seems unresponsive or has already rebooted. Kernel Panic – A voluntary halt to...

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RHEL6 Installation based on Security BenchMarking Recommendations – Part1

1 Install Updates, Patches and Additional Security Software 1.1 Filesystem Configuration Directories that are used for system-wide functions can be further protected by placing them on separate partitions. This provides protection for resource exhaustion and enables the use of mounting options that are applicable to the...

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‘cat’: Concatenate and write files – Linux Command

‘cat’ copies each FILE (‘-‘ means standard input), or standard input if none are given, to standard output.  Synopsis:      cat [OPTION] [FILE]… The program accepts the following options.  ‘-A’ | ‘–show-all’                 Equivalent to ‘-vET’. ‘-b’ | ‘–number-nonblank’    Number all nonempty output lines, starting with 1....

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‘tac’: Concatenate and write files in reverse

  ‘tac’ copies each FILE (‘-‘ means standard input), or standard input if none are given, to standard output, reversing the records (lines by default) in each separately.  Synopsis:      tac [OPTION]… [FILE]… “Records” are separated by instances of a string (newline by default).  By default,...

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Linux Admin Quick Reference – Configuration of Syslog and Rsyslog – Redhat Enterprise Linux

In Red Hat Enterprise Linux 3/4/5, the default system log tool is syslogd which is provided by package sysklogd, but since Red Hat Enterprise Linux 6, the rsyslogd became the default. rsyslog package is also provided since Red Hat Enterprise Linux 5.2.

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‘head’: Output the first part of files

‘head’ prints the first part (10 lines by default) of each FILE; it reads from standard input if no files are given or when given a FILE of ‘-‘. Synopsis:   head [OPTION]… [FILE]… If more than one FILE is specified, ‘head’ prints a one-line header...

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