tag

#cli

2 posts

Shell & TerminalDeep Dive August 9, 2026 4 min read

Portable Shell Option Parsing with getopts: State, Errors, and Reentrancy

A POSIX getopts pattern covering OPTIND, OPTARG, leading-colon diagnostics, required operands, repeated calls, function scope, and portable limitations.

#shell#getopts#posix

macOSHow-To July 11, 2026 4 min read

Managing Time Machine From the Command Line with tmutil

Starting, stopping, inspecting, and restoring Time Machine backups without the GUI — useful for scripting backups or diagnosing a stuck one.

#tmutil#time-machine#cli