Check if command exists

bash

if ! command -v jq >/dev/null 2>&1; then echo 'jq required'; exit 1; fi

Explanation

Portable and very common in setup scripts.

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Same sheet · prioritizing Files and Temporary Paths

Create a secure temporary file.

Open In sheetbashsame section

Create a secure temporary directory.

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Avoid replacing files unnecessarily.

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Walk upward until a matching parent directory is found.

Open In sheetbashsame section

Use env to locate Bash on PATH.

Print timestamped log lines.