How does a shell script evaluate conditional statements?

In bash scripting, conditional statements help in checking whether a specific condition is true or false. When the condition is true, the shell script runs or executes a block of code that is stipulated by the script. Otherwise, the script skips executing the code and jumps to the next conditional statement.

Which command is used to test different conditions in an IF THEN statement?

We can test more than one conditional expression at once, using && to require that two conditions that both must be true. Or, using || to require that either one (or both) of the conditions must be true.

How do you comment in a shell script?

A single-line comment starts with hashtag symbol with no white spaces (#) and lasts till the end of the line. If the comment exceeds one line then put a hashtag on the next line and continue the comment. The shell script is commented out prefixing # character for single-line comment.

How to test if a script is running in Cygwin?

1 @swv: That is easy to test. For example, if you put echo -n helloin a script testit.sh, when run by Cygwin the output will be helloand when run by the Windows command interpreter the output will be -n hello.

Can I keep the same script for Cygwin and Unix?

1 If you don’t mind always including .sh on the script file name, then you can keep the same script for Cygwin and Unix (Macbook). To illustrate: 1. Always include .sh to your script file name, e.g., test1.sh

How to run sh file in Cygwin?

On Windows with Cygwin, you type “test1.sh” to run 4. On a Unix, you also type “test1.sh” to run Note: On Windows, you need to use the file explorer to do following once: 1. Open the file explorer 2. Right-click on a file with .sh extension, like test1.sh 3. Open with… -> Select sh.exe

How do you use if else in shell script?

The if…else…fi statement is the next form of control statement that allows Shell to execute statements in a controlled way and make the right choice. Syntax. The Shell expression is evaluated in the above syntax. If the resulting value is true, given statement(s) are executed.