FAQs (Frequently Asked Questions) related to Bash if statements: Q1. Can I have multiple conditions in a single if statement? A1. Yes, you can combine multiple conditions using logical operators such as && (AND) and || (OR) to create compound conditions within a single if statement. Q2....
If语句通常用于在Bash脚本中做出决定。它们根据可能设置的条件来决定是否运行一段代码。if语句的语法格式有几种,如下: # 1. if语句基本格式:# 注意:观察第一行中使用的空格,在第一行末尾使用分号。两者都必须使# 用,if条件语句以fi结尾if[ condition ];thenstatementsfi # 2. if-else语法格式:if[ condition ...
Using a Bash If Statement with multiple conditions Using Nested If Statements Common Pitfalls and Errors Incorrect usage of the single bracket command [ How to solve the Binary Operator Expected Error? Why you should not use the || and && operators instead of a Bash If Statement? Detailed Exam...
tabs, multiple blanks and all — whereas (2) the unquoted version (echo $VARIABLE) replaces each sequence of one or more blanks, tabs and newlines with a single space.
‘Else if’, or ‘elif’, adds more flexibility to your conditional statements. It allows you to check multiple conditions in a single ‘if’ statement. The script executes the first condition that is true and ignores the rest. Here’s an example of an ‘elif’ statement: ...
除了if和else语句,Bash还提供了case或swith语句和循环结构,可用于简化逻辑,并提高代码的可读性和可持久性。试想一下,创建一个带有多个elif的if语句是什么样子。这种写法会变得非常烦琐! #!/bin/bash VAR=10 # Multiple IF statements if [ $VAR -eq 1 ]; then echo "$VAR" elif [ $VAR -eq 2]; then...
1.4.1 if 循环 # 单条件 if [ expression ]; then statements fi # 多条件与 if [ expression_1 ] && [ expression_2 ]; then statements fi # 多条件或 if [ expression_1 ] || [ expression_2 ]; then statements fi # 多分支 if [ expression_1 ] ; ...
# multiple variables for (( a=1, b=10; a <= 10; a++, b-- )) do echo "$a - $b" done $ ./test9 1 - 10 2-9 3-8 4-7 5-6 6-5 7-4 8-3 9-2 10 - 1 $ while命令的基本格式是: while test command do other commands ...
Return status of most recently executed command $$ Process id of current process Examples: Command Line Arguments7The 'set' command can be used to assign values to positional parameters bash control structures if-then-else case loops for while until select8 if statement statements are executed ...
argument to the script, $2 is the second, etc. OK, now that we've reviewed the function, we can take our first look at "if" statements. If statements Like most languages, bash has its own form of conditional. When using them, stick to the format above; that is, keep the "if" ...