The umask clears permission bits from new files and never adds them
Why a file created with mode 0666 ends up 0644, how to read and set the umask, and why chmod after creation is not masked.
Wildness 1/5 · Tamed
Topic · 8 stories
shell
8 stories tagged shell on AI Tamer, newest first.
One env file, three parsers
The same line in an environment file can give three different values in Docker Compose, a systemd unit and a shell. Three documented differences: comments, backslashes and spaces.
Wildness 1/5 · TamedWhere set -e does not stop a Bash script, and what pipefail adds
Errexit skips failures in conditions, && and || lists, negated commands and early pipeline stages. Learn the rules from the Bash manual and POSIX, and how pipefail closes the pipeline gap.
Wildness 1/5 · TamedA Filename Can Contain the Separator Your Script Assumes
A newline in one filename can turn a transcript-ingestion job into two wrong arguments. Use NUL-delimited find and xargs streams, and keep the boundary intact downstream.
Wildness 1/5 · TamedKeep the Error Body and the Failing Exit Code
Use curl --fail-with-body when a script needs to detect an HTTP error and keep the response text that explains it.
Wildness 1/5 · TamedExit codes: how a CLI tells a script what happened
Bash reports a command status from 0 to 255. This explainer covers 0, 126, 127 and signal exits, then shows why grep and curl need tool-specific handling.
Wildness 1/5 · TamedWhen the wrapper says success and the work failed
A pipeline, a log tee or a local variable can turn a failed command into exit status 0. Patterns that hide failure from CI and AI agents, and how to make the status tell the truth.
Wildness 2/5 · Mostly tamedReading a CLI's help text like a contract
How to read --help, exit codes and the man page of a command-line tool before a script or agent depends on it, with grep, git and curl as examples.
Wildness 1/5 · Tamed
