bashifnot

2016年3月29日 — Logical not (!) is boolean operator, which is used to test whether expression is true or not. For example, if file not exists, then display an ...

2023年12月4日 — In Bash, the 'not equal' operator is represented by '!=' . It's primarily used in conditional statements to compare two values, such as if [ $a ...

2023年11月30日 — The 'if not' statement in bash scripting is used to check if a condition is not true. This can be particularly useful when we want to execute a ...

Example 1. Within the first Bash example of this article, we will be using the “if-not” operator to check which one of the two strings is less than the other.

2014年10月20日 — You can choose: if [[ $? -ne 0 ]]; then # -ne: not equal if ! [[ $? -eq 0 ]]; then # -eq: equal if [[ ! $? -eq 0 ]]; then.

2012年5月11日 — An alternative would be cat /etc/passwd | grep sysa || echo error . Edit: As Alex pointed out, cat is useless here: grep sysa /etc/passwd || ...

2021年1月25日 — Learn how to use the negation of condition statement in bash programming.

Bash 中的if Not 條件 ... 在bash 中，如果命令列表的程式碼為真，那麼 if | then 語句在單詞 then 之後執行一個或多個命令。如果檢查返回false，則在條件需要時執行 else 。

This tutorial aims to help the reader understanding conditions in bash, and provides a comprehensive list of the possibilities.