By Arnold Robbins, Nelson H. F. Beebe
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Shell scripting talents by no means exit of fashion. It's the shell that unlocks the true strength of Unix. Shell scripting is vital for Unix clients and method administrators-a technique to quick harness and customise the total energy of any Unix process. With shell scripts, you could mix the basic Unix textual content and dossier processing instructions to crunch facts and automate repetitive projects. yet underneath this easy promise lies a treacherous ocean of adaptations in Unix instructions and criteria. Classic Shell Scripting is written that can assist you reliably navigate those tough 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, tips to use them via themselves, and together with the opposite courses. The authors are in detail accustomed to the ideas and tips that may be used to create very good scripts, in addition to the traps which may make your top attempt a nasty shell script. With Classic Shell Scripting you'll keep away from hours of wasted attempt. You'll study not just write worthy shell scripts, yet how you can do it competently and portably.
The skill to application and customise the shell speedy, reliably, and portably to get the easiest out of any person method is a vital ability for someone working and conserving Unix or Linux structures. Classic Shell Scripting provides every thing you must grasp those crucial skills.
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Extra resources for Classic Shell Scripting
Figs. 21). 20—Using the whoami command. 21—Using the logname command. • The id command provides additional details about the current user, including the uid, gid, and which groups the user is in, as shown in Fig. 22. 22—Using the id command to gather user and group information for current user. Network Configuration u When documenting the configuration of the subject system, keep an eye open for unusual items. • Look for a Virtual Private Network (VPN) adapter configured on a system that does not legitimately use a VPN.
This information may be helpful in identifying processes that are logging keystrokes or transferring large amounts of data to/from the compromised system. • To gather resource consumption details for a specific target process, use the -p ,target pid . command option. Process to Executable Program Mapping: Full System Path to Executable File u Determine where the executable images associated with the respective processes reside on the system. This effort will reveal whether an unknown or suspicious program spawned the process, or if the associated program is embedded in an anomalous location on the system, necessitating a deeper investigation of the program.
U Identifying logged on users serves a number of investigative purposes: • Help discover any potential intruders logged into the compromised system. • Identify additional compromised systems that are reporting to the subject system as a result of the malicious code incident. • Provide insight into a malicious insider malware incident. • Provide additional investigative context by being correlated with other artifacts discovered. • Obtain the following information about identified users logged onto the subject system: ❒ Username ❒ Point of origin (remote or local) ❒ Duration of the login session ❒ Shares, files, or other resources accessed by the user ❒ Processes associated with the user ❒ Network activity attributable to the user.