From 1811e03485a3a88c0c091ca55678fcf8b78a2b3e Mon Sep 17 00:00:00 2001
From: Vidar Holen <vidar@vidarholen.net>
Date: Sun, 25 Feb 2018 18:06:02 -0800
Subject: [PATCH] Created SC2230 (markdown)

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 1 file changed, 25 insertions(+)
 create mode 100644 SC2230.md

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+## which is non-standard. Use builtin 'command -v' instead.
+
+### Problematic code:
+
+```sh
+which grep
+```
+
+### Correct code:
+
+```sh
+command -v grep
+```
+
+### Rationale:
+
+`which` is a non-standard, external tool that locates an executable in PATH. `command -v` is a POSIX standard builtin, which uses the same lookup mechanism that the shell itself would.
+
+### Exceptions:
+
+None
+
+### Related resources:
+
+* [Check if a program exists from a Bash script](https://stackoverflow.com/a/677212/1899640) on StackOverflow.
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