GET THE HANG [ arduino ] $ 4.2.36 2 502—> apt-cache show arduino Package: arduino Version: 1:1.0.1+dfsg-7 Installed-Size: 1293 Maintainer: Scott Howard Architecture: all Depends: default-jre | java6-runtime, libjna-java, librxtx-java (>= 2.2pre2-3), arduino-core (= 1:1.0.1+dfsg-7) Recommends: extra-xdg-menus, policykit-1 Description-en: AVR development board IDE and built-in libraries Arduino is an open-source electronics prototyping platform based on …
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IFS Internal Field Separator — GNU Bash.
$ 4.2.36 1 501—> echo $* $ 4.2.36 2 502—> echo “$*” $ 4.2.36 3 503—> echo $IFS $ 4.2.36 4 504—> set $IFS=rightleftwrong $ 4.2.36 5 505—> echo $* =rightleftwrong $ 4.2.36 6 506—> echo “$*” =rightleftwrong $ 4.2.36 7 507—> echo $IFS $ 4.2.36 8 508—> echo $* =rightleftwrong $ 4.2.36 9 509—> …
bash -r restricted shell
$ 4.2.36 8 508—> bash -r $ 4.2.36 1 501—> ls Algorithms bookmark bugs-general debian-howtos firewall kernel linux README beautifulwork books config-files Docs https: language ovlfose $ 4.2.36 2 502—> cd .. bash: cd: restricted $ 4.2.36 3 503—> cd / bash: cd: restricted $ 4.2.36 4 504—> ./firewall/firewall.bw bash: ./firewall/firewall.bw: restricted: cannot specify `/’ …
reportbug tool
commandline session $ 4.2.36 8 508—> reportbug –debug Please enter the name of the package in which you have found a problem, or type ‘other’ to report a more general problem. > testing *** Welcome to reportbug. Use ? for help at prompts. *** Note: bug reports are publicly archived (including the email address of …
HACKS AT LINUX KERNEL
Linux(kernel) System Administration 1. Memory Management – Virtual Memory Using /proc/sys/vm
TOOLS PLAN
Project Diagram
GNU bash –noediting and -v
commandline session $ 4.2.36 5 505—> bash –noediting $ 4.2.36 1 501—> tcp bash: tcp: command not found $ 4.2.36 2 502—> $ 4.2.36 2 502—> exit exit $ 4.2.36 6 506—> tcprobe $ 4.2.36 16 516—> bash -v # System-wide .bashrc file for interactive bash(1) shells. # To enable the settings / commands in …
SHLVL – Incremented by one each time an instance of bash is started
commandline session $ 4.2.36 2 501—> echo $SHLVL 1 $ 4.2.36 3 502—> echo $SHLVL 1 $ 4.2.36 4 503—> bash $ 4.2.36 1 500—> echo $SHLVL 2 $ 4.2.36 2 501—> logout bash: logout: not login shell: use `exit’ $ 4.2.36 3 502—> exit exit $ 4.2.36 5 504—> echo $SHLVL 1 $ 4.2.36 …
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BASH_VERSINFO A readonly array variable
commandline session $ 4.2.36 2 501—> echo BASH_VERSINFO[0] BASH_VERSINFO[0] $ 4.2.36 3 502—> echo $BASH_VERSINFO[0] 4[0] $ 4.2.36 4 503—> echo $BASH_VERSINFO 4 $ 4.2.36 5 504—> echo $BASH_VERSINFO[1] 4[1] $ 4.2.36 6 505—> echo BASH_VERSINFO[1] BASH_VERSINFO[1] $ 4.2.36 7 506—> echo “BASH_VERSINFO[1]” BASH_VERSINFO[1] $ 4.2.36 8 507—> echo BASH_VERSINFO(1) bash: syntax error near unexpected …