$ls 1 $strace ls execve(“/bin/ls”, [“ls”], [/* 38 vars */]) = 0 brk(0) = 0x7ae000 access(“/etc/ld.so.nohwcap”, F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb78ab18000 access(“/etc/ld.so.preload”, R_OK) = -1 ENOENT (No such file or directory) open(“/etc/ld.so.cache”, O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=136302, …}) = 0 mmap(NULL, 136302, …
Author Archives: jeffrin
Examining an ELF binary with binutils
$strings a.out /lib64/ld-linux-x86-64.so.2 libc.so.6 printf __libc_start_main __gmon_start__ GLIBC_2.2.5 fffff. []A\A]A^A_ hello ;*3$” GCC: (Debian 4.9.2-10) 4.9.2 GCC: (Debian 4.8.3-13) 4.8.3 hello.c long unsigned int short unsigned int short int GNU C 4.9.2 -mtune=generic -march=x86-64 -g unsigned char long int sizetype main hello.c /home/jeffrin .symtab .strtab .shstrtab .interp .note.ABI-tag .note.gnu.build-id .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.dyn …
6 Framed photos was added to the collection
6 Framed photos was added to the collection 4 small ones and 2 relatively bigger ones All the photos are related to NATIONAL GEOGRAPHIC
Hacking with listing local system locks
ABOUT lslocks lslocks lists information about all the currently held file locks in a Linux system. File locking is a mechanism that restricts access to a computer file by allowing only one user or process access at any specific time. Systems implement locking to prevent the classic interceding update scenario (see race condition). [bash] $lslocks …
Hacking with an arbitrary precision calculator
dc is a reverse-polish desk calculator which supports unlimited preci‐ sion arithmetic. It also allows you to define and call macros. Nor‐ mally dc reads from the standard input; if any command arguments are given to it, they are filenames, and dc reads and executes the contents of the files before reading from standard input. …
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Ultimate Survival Alaska – Competitors :30
[youtube https://www.youtube.com/watch?v=2Z0l5mJ9ls8?rel=0&w=560&h=315]
Introducing The Linux Foundation Certification Program
[youtube https://www.youtube.com/watch?v=Y29qZ71Kicg?rel=0&w=560&h=315]
Example for an Array with processing language
/** * Array. * * An array is a list of data. Each piece of data in an array * is identified by an index number representing its position in * the array. Arrays are zero based, which means that the first * element in the array is [0], the second element is [1], and …
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Hacking with GNU grep . ( grep ‘[1-9]\$’ price.list )
$emacs price.list $grep ‘[1-9]$’ price.list 1 2 3 4 45 46 78 $54 $cat price.list 1 2 3 4 45 46 78 $54 54$ 31$ 21$ $grep ‘[1-9]’ price.list 1 2 3 4 45 46 78 $54 54$ 31$ 21$ $grep ‘[1-9]\$’ price.list 54$ 31$ 21$ $
A program to solve project euler problem 11
[python] # This program is copied from http://code.jasonbhill.com/python/project-euler-problem-11/ # Largest product in a grid # https://projecteuler.net/problem=11 import time start = time.time() L = [] L.append("08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08") L.append("49 49 99 40 17 81 18 57 60 87 17 …
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