Mastering Shell Special Parameters: $*, $@, $#, $$, and $! Explained with Real Examples

This article explains the behavior of key Bash special parameters—$*, $@, $#, $$, and $!—through three practical scripts that demonstrate argument expansion, counting, arithmetic operations, and process ID retrieval, highlighting the differences and typical use cases.

BashScriptingShell

0 likes · 5 min read

Mastering Shell Special Parameters: $*, $@, $#, $$, and $! Explained with Real Examples

Liangxu Linux

May 30, 2021 · Fundamentals

Mastering Shell Special Parameters: $*, $@, $#, $$, $! with Real Examples

This article explains the purpose and behavior of key shell special parameters—$*, $@, $#, $$, and $!—through three practical scripts that demonstrate expanding positional arguments, counting arguments, and accessing process IDs, complete with code snippets and expected output.

BashScriptingShell

0 likes · 4 min read

Mastering Shell Special Parameters: $*, $@, $#, $$, $! with Real Examples