Category: Redhat Enterprise Linux 6


RHEL6 Installation and Security Bench Marking Recommendations – Part3

Configuring and Tuning Special Purpose Services This section describes services that are installed on servers that specifically need to run these services. If any of these services are not required, it is recommended that they be disabled or deleted from the system to reduce the potential...


RHEL6 Installation based on Security Bench Marking Recommendations – Part2

Configuration and Tuning of OS Services While applying system updates and patches helps correct known vulnerabilities, one of the best ways to protect the system against as yet unreported vulnerabilities is to disable all services that are not required for normal system operation. This prevents the...


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...


‘sum’: Print checksum and block counts

‘sum’ computes a 16-bit checksum for each given FILE, or standard input if none are given or for a FILE of ‘-‘.  Synopsis:      sum [OPTION]… [FILE]…


‘wc’: Print newline, word, and byte counts

‘wc’ counts the number of bytes, characters, whitespace-separated words, and newlines in each given FILE, or standard input if none are given or  for a FILE of ‘-‘.  Synopsis:      wc [OPTION]… [FILE]…


‘cksum’: Print CRC checksum and byte counts

‘cksum’ computes a cyclic redundancy check (CRC) checksum for each given FILE, or standard input if none are given or for a FILE of ‘-‘. Synopsis:      cksum [OPTION]… [FILE]…


‘split’: Split a file into pieces

‘split’ creates output files containing consecutive or interleaved sections of INPUT (standard input if none is given or INPUT is ‘-‘). Synopsis:      split [OPTION] [INPUT [PREFIX]] By default, ‘split’ puts 1000 lines of INPUT (or whatever is left over for the last section), into each...


‘tail’: Output the last part of files

‘tail’ prints the last 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: tail [OPTION]… [FILE]… If more than one FILE is specified, ‘tail’ prints a one-line header consisting...


‘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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