Utilizing the Bash If Statement in One Line In this section, we use the “if” statement in a single line. To do this, we first use the Bash shell which is “#!/bin/bash” just like in the previous example. The “if” expression is then employed in the line after that to determin...
When you just want to see the result in the shell itself, you may use the if else statements in a single line in bash. Suppose you have this bash script. if [ $(whoami) = 'root' ]; then echo "You are root" else echo "You are not root" fi You can use all the if else stat...
((i++)) if [[ "$i" == '2' ]]; then break fi done echo 'All Done!' Number: 0 Number: 1 All Done! continue语句 continue语句退出循环的当前迭代,并将程序控制传递给循环的下一次迭代。 在下面的内容中,一旦当前迭代项等于2continue语句,将导致执行返回到循环的开始并继续下一次迭代。 i=0 whi...
while read -r line do let count=`expr $count + 1` if [ `expr match $line $ANDROID_FOLDER` == "$ANDROID_FOLDER_LEN" ] || [ `expr match $line $KERNEL_FOLDER` == "$KERNEL_FOLDER_LEN" ] || [ `expr match $line $UBOOT_FOLDER` == "$UBOOT_FOLDER_LEN" ];then echo "$count...
if [ -d "/Applications/Install OS X Yosemite.app" ] $ then$ echo "Application is already downloaded and ready to continue."$ sleep 4$ break$ elif [ -f "$script_dir\Yosemite.tar.gz" ]$ then$ echo -n "Extracting archive to Applications directory... "$ ...
我们常见的case ... in ... esac语句,if ... elif ... else语句,while ... do ... done语句,for ... in ...; do ... done,甚至函数function name() {...}都属于复合命令。 for 语句 for循环常见的完整格式是: Copy forname [inword ] ;dolist ;done 除此...
Introduction to the Bash If Statement What is the syntax of a Bash If Statement? What are the double Parentheses ((…)), single […], and double [[..]] Square Brackets? What are the Bash Conditional Expressions? How to use an If Statement with Then, Else, Else If (elif) clauses?
16.2. Single quotes Single quotes in bash will suppress special meaning of every meta characters. Therefore meta characters will be read literally. It is not possible to use another single quote within two single quotes not even if the single quote is escaped by backslash. ...
for str in "${string_array[@]}"; do echo $str done 如何SSH到另一台主机并在其上运行几个命令? #!/bin/bash # 先配置SSH的免密,之后执行此脚本 hostname ssh root@10.245.110.69 'hostname; whoami; date' hostname 如何使用IF语句比较字符串的值?
}Or, if you want to write it in a single line:function_name () { first command; second command; }The second method to write a function is using the reserved word function followed by the function name. This eliminates the need for parentheses:...