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...
if elif else Shell 支持任意数目的分支，当分支比较多时，可以使用 if elif else 结构，它的格式为：...
An important thing to keep in mind is that, like C programming, shell scripting is case sensitive. Hence, you need to be careful while using the keywords in your code. How to use if-else in shell script It is easy to see the syntax of a function and believe you know how to use it...
> - is greater than, in ASCII alphabetical order - if [[ "$a" > "$b" ]] -z - string is null, that is, has zero length Examples: [ s1 = s2 ] (true if s1 same as s2, else false) [ s1 != s2 ] (true if s1 not same as s2, else false) [ s1 ] (true if s1 is ...
Else If in PowerShell Introduction to Else If in PowerShell If / else conditions are the most useful conditions in a scripting language and you may want to use multiple times while writing script. If the first condition in If the statement fails then the second stage is ElseIf statement. ...
perform repeated arithmetic computations, or access complex databases, or if you want functions and complex control structures, you’re better off using a scripting language likePython,Perl, or awk, or perhaps even a compiled language like C. (This is important, so we’ll repeat it throughout...
if...else...fi Nested ifs Multilevel if-then-else Loops in Shell Scripts for loop Nested for loop while loop The case Statement How to de-bug the shell script? Chapter 4:Advanced Shell Scripting Commands /dev/null - to send unwanted output of program ...
Introduction to Switch Case in Shell Scripting When we need to perform multilevel checks we can use multiple if and else conditions or nested if-else branches but when we need to perform all conditional operations on a particular variable then it better to use switch case. Inshell scriptingswit...
This Unix Shell Scripting tutorials will give you an overview of Unix shell programming and provide an understanding of some standard shell programs. This includes shells such as the Bourne Shell (sh) and the Bourne Again Shell (bash).
if [ -f ~/.bashrc ]; then . ~/.bashrc fi This is called an if compound command, which we will cover fully when we get to shellscripting in Part 5, but for now we will translate: 这叫做一个 if 复合命令,我们将会在第五部分详细地介绍它,现在我们对它翻译一下: 代码语言:javascript 复制...