Using Case statement in bash You can alsouse case statements in bashto replace multiple if statements as they are sometimes confusing and hard to read. The general syntax of a case construct is as follows: case "variable" in "pattern1" ) Command … ;; "pattern2" ) Command … ;; "patt...
Bash supports if-else statements so that you can use logical reasoning in your shell scripts. The generic if-else syntax is like this: if [ expression ]; then ## execute this block if condition is true else go to next elif [ expression ]; then ## execute this block if condition is t...
在 bash shell 脚本中,If 语句可以以 If、If- else、If- If- else、netsted If 和 case 的形式使用。 If Statement Syntax: if [ condition_command ] then command1 command2 …….. last_command fi Bash 提供逻辑运算符来组合 if 语句中的多个条件,常见的逻辑运算符如下: -eq: 等于 -ne: 不等于 ...
In a bash script,if statementchecks whether a condition is true or not. If so, the shell executes the block of code associated with the if statement. If the statement is not true , the shell jumps beyond the end of if statement block & continues on. If Statement Syntax: if [ condition...
Below is the general syntax ofIFELIFandELSEin bash: ifCONDITION-TO-TEST;then CODE-TO-EXECUTE-1 elifNEXT-CONDITION-TO-TEST;then CODE-TO-EXECUTE-2 elifNEXT-CONDITION-TO-TEST;then CODE-TO-EXECUTE-2 else CODE-TO-EXECUTE-2 fi Note: In the above general syntax that you can include zero, on...
syntax error near unexpected token `if' 发布于 2 月前 ✅ 最佳回答: 建议尝试以下方法#!/bin/basholdFiles.txt janeSearch=$(grep“jane”。/data/list.txt | cut-d'-f 1,3)搜索中的x;如果(测试-e~/$x);然后echo$x>>oldFiles.txtfi完成...
Checking the exit status using an ‘if’ statement in Bash Using a “if” statement and the “$?” variable, we can determine whether a command or script has executed successfully. Which holds the exit status of the most recent command executed, the syntax of the “if” statement for dete...
syntax error near unexpected token fi 等都是这样引起的. 5 if 后面一定要跟上 then. 同理 elif 后面一定要跟上 then. 不然提示出错信息: syntax error near unexpected token else top BASH IF http://lhsblog01.blog.163.com/blog/static/10200451920081118105937818/ ...
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。
Syntax: if [ condition_command ] then command1 command2 …….. last_command fi Bash 提供逻辑运算符来组合 if 语句中的多个条件,常见的逻辑运算符如下: -eq: 等于 -ne: 不等于 -lt: 小于 -le: 小于等于 -gt: 大于 -ge: 大于等于 在下面的 bash 脚本示例中,我们使用 if 条件语句比较两个数字。