tag

#exit-status

5 posts

Shell & TerminalDeep Dive October 4, 2026 7 min read

cmp Exit Status in Shell: Equal Files, Different Files, and Errors

Handle cmp's three outcomes correctly when comparing artifacts, preserving difference-versus-error semantics in conditionals and pipelines.

#cmp#exit-status#files

Shell & TerminalDeep Dive October 4, 2026 7 min read

Grep in Production Shell Scripts: Match Results, Errors, and Pipeline Status

Handle grep's match, no-match, and error statuses explicitly while preserving filenames, pipeline failures, and predictable regular-expression behavior.

#grep#shell#exit-status

Shell & TerminalDeep Dive October 3, 2026 8 min read

Bash && and || Lists: Equal Precedence, Short-Circuiting, and Safer Branches

Reason about Bash AND-OR lists correctly, avoid rollback bugs from mixed operators, and preserve the intended status flow.

#bash#control-flow#exit-status

Shell & TerminalDeep Dive October 3, 2026 9 min read

Bash (( )) Arithmetic Commands: Exit Status, for Loops, and Safe Checks

Understand Bash arithmetic-command status, increment edge cases, integer evaluation, and interactions with errexit and conditional lists.

#bash#arithmetic#exit-status

Shell & TerminalDeep Dive October 3, 2026 8 min read

Fish Pipeline Status Semantics: Inspecting Every Stage Without Losing Context

Read Fish pipeline results correctly with status and pipestatus, snapshot stage codes before they change, and distinguish real failures from expected SIGPIPE.

#fish#pipelines#exit-status