https://stackoverflow.com/questions/4277665/how-do-i-compare-two-string-variables-in-an-if-statement-in-bash http://www.masteringunixshell.net/qa36/bash-how-to-add-to-array.html https://www.cyberciti.biz/faq/linux-unix-bash-for-loop-one-line-command/ https://www.claudiokuenzler.com/bl...
The syntax of the if statement in Bash is: if first-test-commands; then consequent-commands; [elif more-test-commands; then more-consequents;] [else alternate-consequents;] fi Tests commands in the bash if statement, and bash elif clauses, are executed in order until one test succeed....
You can use this if .. elif.. if , if you want to select one of many blocks of code to execute. It checks expression 1, if it is true executes statement 1,2. If expression1 is false, it checks expression2, and if all the expression is false, then it enters into else block and...
While ‘else if’ is a powerful tool for handling multiple conditions in bash scripting, it’s not the only one. An alternative approach is the ‘case’ statement. ‘Case’ statements can be more readable and easier to maintain than a long list of ‘elif’ conditions, especially when you’...
# For statement in one line for((i=1;i<=10;i+=2)); do echo "Welcome $i times"; done 如何建立一个字符串数组,并且查看每一个字符串? #!/bin/bash declare -a flush_results flush_results+=("1.Hello") flush_results+=("2.World") ...
line done 使用while循环 while read -r line do echo $line done < filename While循环中read命令从标准输入中读取一行,并将内容保存到变量...line中。...在这里,-r选项保证读入的内容是原始的内容,意味着反斜杠转义的行为不会发生。输入重定向操作符文件file,然后将它作为read命令的标准输入。......
STATEMENT .. fi if语句的双分支结构: if 命令; then 命令; else 命令; fi 注意:是否会执行then或else后面的命令,取决于if后面的命令的执行状态返回值; 1.如果其返回值为真,则执行then后面的命令; 2.如果其但回执为假,则执行else后面的命令; 建议在脚本中的书写格式: ...
Bonus: Bash if else statement in one line So far all the if else statement you saw were used in a proper bash script. That's the decent way of doing it but you are not obliged to it. When you just want to see the result in the shell itself, you may use the if else statements...
if语法更短 # One line # Note: The 3rd statement may run when the 1st is true [[ $var == hello ]] && echo hi || echo bye [[ $var == hello ]] && { echo hi; echo there; } || echo bye # Multi line (no else, single statement) ...
$ type if; type then; type else; type elif; type fi if is a shell keyword then is a shell keyword else is a shell keyword elif is a shell keyword fi is a shell keyword And as you can see, they all are keywords. Next, try an if on one line, with integers and incorporate the...