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About this tool
Generate a safe bash script skeleton with strict mode, ERR and EXIT traps, usage, logging, root check and a flock guard.
This generator produces a complete bash script skeleton with the "unofficial strict mode" (set -Eeuo pipefail and a newline-tab IFS), an ERR trap that reports the failing line, an EXIT cleanup trap around mktemp -d, getopts option parsing, timestamped logging and an optional flock(1) guard against overlapping runs. It is built for sysadmins and developers who want every new script to start from a safe, ShellCheck-friendly base instead of a bare shebang.
Open Bash Script Scaffold Generator on AltFTool — it loads instantly in your browser.
Provide your input — an image, text, or data.
Let the tool analyze or generate the result.
Review, refine, and reuse the output wherever you need it.
set -Eeuo pipefail plus tight IFS stops silent failures and unset-variable typos.
ERR trap reports the failing line; a single EXIT trap removes the mktemp scratch dir on every exit path.
The optional flock self-lock re-execs the script under an exclusive lock so a second copy exits immediately.
It combines four safety switches: -e exits on any failing command, -u treats unset variables as errors, -o pipefail makes a pipeline fail if any stage fails, and -E makes ERR traps fire inside functions and subshells. Together they turn silent failures into immediate, visible errors.
Wrap the script in flock. The generated skeleton uses the self-exec pattern — it re-runs itself under flock -en on a lock file in /tmp — so a second instance exits immediately with a clear message instead of stacking up behind a slow run.
Because the last line never runs when the script errors out or is killed. A trap on EXIT runs on every exit path — success, set -e failure, or SIGTERM — so the mktemp -d scratch directory is always removed exactly once.
env finds bash on the PATH, which matters on systems where bash is not in /bin — notably macOS users who install a newer bash via Homebrew, and BSDs. #!/bin/bash is fine when the script only ever targets standard Linux hosts. The generator offers both.