Create eg_ifel.sh

Special: 600 commits total. Milestone.

Author: XuhuaHuang

BashExample/eg_ifel.sh

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+#!/bin/bash
+
+# Commonly used commands with this file:
+# bash --version
+# cat eg_ifel.sh
+# bash eg_ifel.sh
+
+age=0  # initialize a variable age to 0
+# Provide instruction and ask for user input
+echo -n 'Pleaes enter your age: '
+read age
+# Ouput to terminal
+printf 'You claimed to be %d years old.\n' $age
+
+# Determine the range of age
+if [ ${age} -lt 18 ]; then
+    echo 'You are under 18 years old.'
+elif [ ${age} -eq 20 ]; then
+    echo 'You may get popcorn because you are 20.'
+else
+    echo 'You may proceed.'
+    exit 1
+fi
+
+echo 'This line may not be executed.'
+
+# -gt (greater than) >
+# -ge (greater or equal to) >=
+# lt (less than) <
+# -le (less than or equal to) <=
+# -eq (equal to) ==
+# -nq (not equal to) !=