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.
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 || ...