Bash scripting is a powerful tool for automating tasks in the Linux environment. One of the key elements of any programming or scripting language is conditional logic, and in Bash, this is achieved through if statements. In a bash script,if statementchecks whether a condition is true or not....
以下是一些Bash 4+示例: 示例1,在字符串中检查是否存在'yes'(不区分大小写): if [[ "${str,,}" == *"yes"* ]] ;then 示例2,检查字符串中是否包含“yes”(不区分大小写): if [[ "$(echo "$str" | tr '[:upper:]' '[:lower:]')" == *"yes"* ]] ;then 示例三,检查字符串中是...
'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that allows your scripts to make decisions based on various scen...
If this, then that else something else. Doesn't make sense? It will after you learn about the if-else statements in bash shell scripting. Bash supports if-else statements so that you can use logical reasoning in your shell scripts.
if语法[Linux(bash_shell)] http://blog.csdn.net/ycl810921/article/details/4988778 1: 定义变量时, =号的两边不可以留空格. eg: gender=femal---right gender =femal---wrong gender= femal---wrong 2 条件测试语句 [ 符号的两边都要留空格.
Example 7: If Else Statement in Bash Scripting We will now demonstrate theELSEcondition. TheELSEcondition is used in the case where theIFcondition or all theELIFconditions do not exist then theELSEcondition will be used and the code in theELSEcondition will be executed. Let’s add an example...
Bash脚本中意外标记“if”附近的语法错误 bash scripting 试图定位包含jane的文件列表中的所有行,然后测试结果是否作为真实文件存在,并将它们的名称附加到文档中。这是我的密码:#!/bin/bash > oldFiles.txt janeSearch=$( grep " jane " ../data/list.txt | cut -d ' ' -f 1,3 ) for x in $jane...
In Bash scripting, the exit status of a command or script is an important piece of information that can determine the success or failure of a script or a particular command. A command or script’s exit status, which is a numeric value, shows whether it was successful or encountered an err...
注意，test是一个外部程序，需要衍生出对应的进程，而[是Bash的一个内部函数，因此后者的执行效率更高。
if-statement-bash-scripting-example Nested if Statement If 语句和 else 语句可以嵌套在 bash 脚本中。关键字 fi 显示了内部 if 语句的结束,所有 if 语句都应该以关键字 fi 结束。 Syntax : if [ condition_command ] then command1 command2 …….. last_command else if [ condition_command2 ] then c...