system calls

Profiling Bash scripts with `perf stat` helps optimize performance by analyzing CPU and system call usage. Simple to use, developers can prepend `perf stat` to their command, receiving detailed output on CPU cycles, cache hits, and more, aiding in pinpointing inefficiencies and understanding resource use in Linux environments.

The article explains how to use `strace`, a Linux tool for debugging scripts by tracing system calls and signals. It covers `strace`'s functionality in capturing syscall-level interactions, which aids in diagnosing errors and inefficiencies that are tough to find at the script logic level. Key flags like `-o`, `-e`, `-p`, and `-f` are detailed, with examples illustrating `strace` in action on simple script operations such as file reading and writing.

Explore the essentials of using system calls with Bash in Linux, guiding beginners on tasks like file management and automation. The article explains installing the `syscall` utility, using it across Linux distributions, and includes practical examples like fetching system time and disk usage monitoring. Perfect for those wanting to boost their scripting skills and understand core system operations.

This detailed guide discusses Linux signals, focusing on types like SIGHUP, SIGINT, and SIGKILL, and their behaviors, especially how SIGKILL and SIGSTOP cannot be modified. It explores signal effects on processes, providing valuable insights for programmers at all levels, and includes links for further learning on signal handling.