alxmal · December 6, 2023 19:58 · Nov 2, 2018 · Nov 2, 2018
diff --git a/magic_jq_task.sh b/magic_jq_task.sh
@@ -6,7 +6,7 @@ set -e
 # Function that checks if a given executable is on the path. If it isn't, prints an install message and exits.
 # Usage: check_binary EXECUTABLE_NAME INSTALL_MESSAGE
 check_binary() {
-  if ! which "$1"; then
+  if ! which "$1" > /dev/null; then
     # Using a subshell to redirect output to stderr. It's cleaner this way and will play nice with other redirects.
     # https://stackoverflow.com/a/23550347/225905
     ( >&2 echo "$2" )

diff --git a/magic_jq_task.sh b/magic_jq_task.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# Exit on the first command that returns a nonzero code.
+set -e
+
+# Function that checks if a given executable is on the path. If it isn't, prints an install message and exits.
+# Usage: check_binary EXECUTABLE_NAME INSTALL_MESSAGE
+check_binary() {
+  if ! which "$1"; then
+    # Using a subshell to redirect output to stderr. It's cleaner this way and will play nice with other redirects.
+    # https://stackoverflow.com/a/23550347/225905
+    ( >&2 echo "$2" )
+    # Exit with a nonzero code so that the caller knows the script failed.
+    exit 1
+  fi
+}
+
+check_binary "jq" "$(cat <<EOF
+You will need jq to run this script.
+Install it using your package manager. E.g. for homebrew:
+brew install jq
+EOF
+)"
+
+# a dumb command that uses jq in order to provide a SSCCE snippet
+# http://sscce.org/
+jq -r ".message" <<EOF
+{"message": "hello from jq!"}
+EOF
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