By Arnold Robbins, Nelson H. F. Beebe
Shell scripting talents by no means exit of favor. It's the shell that unlocks the genuine capability of Unix. Shell scripting is key for Unix clients and process administrators-a option to quick harness and customise the total energy of any Unix process. With shell scripts, you could mix the elemental Unix textual content and dossier processing instructions to crunch information and automate repetitive projects. yet underneath this straightforward promise lies a treacherous ocean of adaptations in Unix instructions and criteria. vintage Shell Scripting is written that can assist you reliably navigate those difficult waters.
Writing shell scripts calls for greater than only a wisdom of the shell language, it additionally calls for familiarity with the person Unix courses: why every one is there, easy methods to use them through themselves, and together with the opposite courses. The authors are in detail acquainted with the guidelines and tips that may be used to create very good scripts, in addition to the traps which may make your most sensible attempt a foul shell script. With vintage Shell Scripting you'll steer clear of hours of wasted attempt. You'll examine not just write helpful shell scripts, yet how you can do it adequately and portably.
The skill to application and customise the shell quick, reliably, and portably to get the easiest out of anyone method is a crucial ability for an individual working and protecting Unix or Linux structures. vintage Shell Scripting grants every thing you must grasp those crucial skills.
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Extra info for Classic Shell Scripting
Dumping pages 16 to 158... 00257154 s, 228 MB/s Dumping pages 256 to 261871... 16—Using SecondLook physical memory acquisition script to gather physical memory. • Alternately, SecondLook provides a Physical Memory Access Driver called pmad to acquire memory, as shown in Fig. 16. In order to avoid running the version of /bin/dd on the compromised system, edit the secondlook-memdump script to call a trusted version of dd instead. • The operation in Fig. 16 shows the custom pmad kernel module being loaded prior to executing SecondLook to acquire memory.
15—Using fmem to acquire physical memory. • The fmem kernel module bypasses the restrictions of the/dev/mem device file by creating a new device named /dev/fmem that provides access to the full contents of memory as shown in Fig. 15. 10 • As noted in the fmem output above, if the amount of memory is not specified, then dd will continue attempting to read higher address ranges indefinitely, even if there is no more physical RAM on the system. Therefore, it is important to specify how much memory to acquire using the count argument of dd.
This same information may not be readily accessible or easily displayed from the memory dump after it is loaded on a forensic workstation for examination. Investigative Considerations • It may be necessary in some cases to capture some nonvolatile data from the live subject system and perhaps even create a forensic duplicate of the entire disk. For all preserved data, remember that the Message Digest 5 (MD5) and other attributes of the output from a live examination must be documented independently by the digital investigator.
Classic Shell Scripting by Arnold Robbins, Nelson H. F. Beebe