Shell Script Portability Techniques for writing shell scripts that work across different platforms and environments. Shebang Selection Bash Scripts POSIX Shell Scripts Bash vs POSIX Differences Arrays (Bash only) Test Syntax String Operations Arithmetic Platform Differences macOS vs Linux sed Differences readlink Differences Detecting Environment Operating System Architecture Shell Detection Portable Patterns Reading Files Temporary Files Command Existence Check String Contains ShellCheck Compatibility Disabling Warnings for Portability Testing Multiple Shells Best Practices 1. Choose the rig…