How do you write multiple if conditions in shell?
How do you write multiple if conditions in shell?
To use multiple conditions in one if-else block, then elif keyword is used in shell. If expression1 is true then it executes statement 1 and 2, and this process continues. If none of the condition is true then it processes else part.
How do I use multiple if in bash?
In Bash elif, there can be several elif blocks with a boolean expression for each one of them. In the case of the first ‘if statement’, if a condition goes false, then the second ‘if condition’ is checked….Syntax of Bash Else If (elif)
- if [ condition ];
- then.
- elif [ condition ];
- then.
- else.
What is the syntax of nested IF statement in shell scripting?
A syntax of if-else statement in Bash Shell Scripting can be defined as below: if [ condition ]; then.
What is option in if condition in shell script?
The if in a Bash script is a shell keyword that is used to test conditions based on the exit status of a test command. An exit status of zero, and only zero, is a success, i.e. a condition that is true. Any other exit status is a failure, i.e. a condition that is false.
How do you write not equal to in shell script?
Linux bash not equal operator is expressed with the “-ne” which is the first letter of “not equal”. Also the “! =” is used to express not equal operator.
Can you nest if statements in bash?
If statement and else statement could be nested in bash. The keyword “fi” indicates the end of the inner if statement and all if statement should end with the keyword “fi”. The “if then elif then else fi” example mentioned in above can be converted to the nested if as shown below.
What is F in shell script?
38. From bash manual: -f file – True if file exists and is a regular file. So yes, -f means file ( ./$NAME. tar in your case) exists and is a regular file (not a device file or a directory for example).
How do you write a command line argument in shell script?
Arguments or variables may be passed to a shell script. Simply list the arguments on the command line when running a shell script. In the shell script, $0 is the name of the command run (usually the name of the shell script file); $1 is the first argument, $2 is the second argument, $3 is the third argument, etc…
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 apply multiple conditions using if statement in bash script?
…….. In bash script, if you wish to apply multiple conditions using if statement then use ‘ if elif else’. In this type of conditional statement, if the first condition is met then code below it will be executed otherwise next if condition will checked and if it is not matched then commands mentioned below else statement will be executed.
What are the conditional statements in shell script?
Conditional Statements | Shell Script 1 if statement 2 if-else statement 3 if..elif..else..fi statement (Else If ladder) 4 if..then..else..if..then..fi..fi.. (Nested if) 5 switch statement
What is the syntax of if-else in shell script?
“if-else” is dealing with two-part of the executions. If the “if-else “condition is “true” then the first group of statements will execute. If the condition is “false” then the second group of statements will execute. Syntax of if-else in Shell Scripting:
What is the difference between “if else condition/control statement” and “condition”?
If the condition is true. Then the “Statement 1” will execute. If the condition is false then “Statement 2” will execute. In “if else condition/control statement”, anyhow it will execute the condition.
