Misc_Linux_Topics.md

To-do:

• Include ROP C Man Pages
• Include source, Logic operators, stdout/stderror, $, $_, $?, !!, etc. Process substitution operations, piping & redirectors.

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General use Debuggers & profilers:

GDB : PWNDBG

Python application -> Github -> Activation via .gdbinit

PYTHON DEBUGGERS

1.- PDB

• Default python debugger

pdb my_program.py

2.- IPDB

• Improved pdb

pip3 install ipdb

Run:
python -m ipdb my_program.py

(PYTHON) LINTERS - vim + python

(ALE TOOLS):

• Install i.e. flake8 or pyflake
• .vimrc -> ale tools (Plug 'w0rp/ale')
• .vimrc configured
• ALEToggle (on/off)

Time - user/real/sys

user@host:~/code$ cat time.py
#!/usr/bin/python

import time

time.sleep(7)
user@host:~/code$ time python3 time.py

real	0m7.034s
user	0m0.023s
sys	0m0.008s

PERF: Tracing Program stats:

root : /home/user/code >> perf stat python3 shell.py
# sleep 2
# exit

 Performance counter stats for 'python3 shell.py':

             39.02 msec task-clock                #    0.003 CPUs utilized          
                27      context-switches          #    0.692 K/sec                  
                 9      cpu-migrations            #    0.231 K/sec                  
             1,758      page-faults               #    0.045 M/sec                  
        45,658,036      cycles                    #    1.170 GHz                    
        43,580,502      instructions              #    0.95  insn per cycle         
         9,649,258      branches                  #  247.296 M/sec                  
           428,845      branch-misses             #    4.44% of all branches        

      13.585309315 seconds time elapsed

       0.033763000 seconds user
       0.006815000 seconds sys