bash 中的条件语句，基础就是 Test 。 if 先来个实例： x=5; if [ $x = 5 ]; then echo 'x equals 5.'; else echo 'x does not equal 5'; fi # 输出： x equals 5. 和我们熟悉的语言非常相似，不妨抽象
附录MultiLine标签分隔文本表单Bash脚本与EOF,EOT,EOL 技术标签: Linux. 抨击 多数 EOF.我想在特定的字符串发生后插入多行文文本。预期的产出是:configuration options: <tab>option 1 <tab>option 2 <tab>option 3 <tab>option 4 <tab>option 5 <tab>option 6 <tab>option 7 <tab>option 8 <tab>option...
Lines 4-9demonstrate how to define a function using thefunctionreserved word. The functionf1uses a multiline syntax in lines 4-6, whereasf2uses one line syntax on line 9. Lines 13-18show the more familiar syntax.f3is a multiline function defined in lines 13-16, whilef4on line 18 is t...
When writing shell scripts you may be in a situation where you need to pass multiline block of text or code to an interactive command. In Bash and other shells like Zsh a Here document (Heredoc) is a type of redirection that allows you to pass multiple l
1. Using your favorite text editor, create a shell script calledsyntax. If you're using Vim, run the following line in the terminal: vim syntax.sh 2. Add the code below to the shell script: # syntax.sh# Declaring functions using the reserved word function# Multilinefunctionf1 {echoHello...
multiline-comment.sh #!/bin/bash : ' The following script calculates the square value of the number, 5. ' ((area=5*5)) echo $area while while-example.sh #!/bin/bash count=0 while [ $count -lt 5 ] do echo $count ((count++)) done while-infinite-loop.sh #!/bin/bash while ...
可以用来检测变量是否被设置# ${var?error_info},可以用来做必要参数检查:${var?}:${var?test message}# 空指令版本的注释:<<MULTILINECOMMENT coomandd \sds ~2@* MULTILINECOMMENT# 扩展单引号中被转义的字符串为ACSIIecho$'\n\n\n'# 变量赋值,使用命令执行结果,等同于echo `cat /etc/hostname`echo$...
The above script test for the first argument and would produce the following output when ran with and argument and without. [me@linux ~]$ bash myScript HelloGot Hello. Success![me@linux ~]$ bash myScriptmyScript: line 1: 1: Error: Argument not provided ...
After executing the line, the bash script will be in a here document, PowerShell script will be in a multiline-comment, and the batch script will continue executing normally. After each language is done executing, we terminate it. This prevents us from needing to work around its quirks ...
$ bash multiline-comment.sh You can check the following link to know more about the use of bash comment. Go to top Using While Loop: Create a bash file with the name, ‘while_example.sh’, to know the use of while loop. In the example, while loop will iterate for 5 times. The ...