Dev-Misc Cheat Sheet Edit Cheat Sheet

Misc

• JSON Linting

  python -mjson.tool input.json
  

• iotrack: LD_PRELOAD based I/O tracking
• Linux Debugging Techniques: DeveloperWorks article on many debugging tools: MEMWATCH, YAMD, electric fence, gdb, kgdb, kdb
• Google Address Sanitizer (Asan) for GCC 4.8+ and LLVM
• cppcheck - static code analysis

• ELF Inspection

  readelf -l <binary
  

• kcachegrind: callgrind visualization

• Object Dumping

  objdump -t <object file>   # print symbols table
  objdump -dS <object file>  # print assembly along source lines
  

• Fedora - Crash Tracker retrace.fedoraproject.org/faf
• Ubuntu - Crash Tracker errors.ubuntu.com

• Java - Debugging Flags

  J-Xdebug -J-Xnoagent -J-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=9876
  

• Gearman - Jobserver

Security

• Kernel Sandboxing with Seccomp
• Secure Programming for Linux and Unix HOWTO
• OWASP Cheat Sheets

Test Frameworks

Low-level C test frameworks:

• Glib Testing

• lcov - GCC based test coverage metrics:

  apt-get install lcov
  CLAGS=--coverage ./configure
  # Run tests
  lcov --capture --directory <project-dir> --output-file coverage.info
  genhtml coverage.info --output-directory out
  

• Ruby rspec - Launch tests

  # There are a lot of rspec launch variants:
  autotest
  rspec <path to .rb spec file>
  rspec <path to directory>
  bundle exec rspec <path to .rb spec file>
  

Java

• Why JVM eats more memory than configured via xmx…
• Why JVM eats more memory than configured…

Web

• Color Theory
  • http://paletton.com (Palette Generator)
  • https://www.smashingmagazine.com/2016/04/web-developer-guide-color/
• Javascript Design Patterns
• jsfiddle.net - JS sharing and testing
• Javascript - Key Event Codes

• Javascript - JSON dumping

  console.log(JSON.stringify(obj));
  console.log(JSON.stringify(obj), null, 3);  // indented by 3 spaces
  

• Javascript - ESLint: ECMAScript linter

• PHP - simple webserver

  php -S localhost:8000
  

• Python - simple webserver

  python -m SimpleHTTPServer
  

XML

• Pretty-print XML:

  xmllint --format my.xml
  

• XPath on the command line

  # Print subtree of tag 'sometag'
  xmllint --xpath "//sometag" data.xml
  
  # Match an attribute 'someattr' of 'sometag' to have literal 'string'
  xmllint --xpath "//sometag[contains(@someattr, 'string')" data.xml