[BASH] Snippets

Number

• ref: linux - How do I test if a variable is a number in Bash? - Stack Overflow
• ref: Checking if a Variable Is a Number in Bash | Baeldung on Linux

String

Bash Strings Comparison Operators

Operator	Description
[str1] == [str2]	The equality operator returns TRUE if both operands are equal. Used with the [[ command.
[str1] != [str2]	The inequality operator returns TRUE if the specified operands are not equal.

• ref: How to Compare Strings in Bash | Linuxize

Sleep

#!/bin/bash
echo "Hi, I'm sleeping for 5 seconds..."
sleep 5

• 並非所有版本的 BASH 都支援時間單位如下, 使用前需確認.

  語法：sleep NUMBER[SUFFIX]
  SUFFIX 可以是:

  s for seconds (the default)
  m for minutes.
  h for hours.
  d for days.

See Also