What does %% do in bash?
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What does %% do in bash?
In your case ## and %% are operators that extract part of the string. ## deletes longest match of defined substring starting at the start of given string. %% does the same, except it starts from back of the string.
What is in if condition in shell?
If specified condition is not true in if part then else part will be execute. 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.
Does bash have if-else?
Bash allows you to nest if statements within if statements. You can place multiple if statements inside another if statement. The following script will prompt you to enter three numbers and print the largest number among the three numbers.
What is if option in shell script?
if is a command in Linux which is used to execute commands based on conditions. The ‘if COMMANDS’ list is executed. If its status is zero, then the ‘then COMMANDS’ list is executed.
How do you write an if-else in a script?
JavaScript if, else, and else if
- Use if to specify a block of code to be executed, if a specified condition is true.
- Use else to specify a block of code to be executed, if the same condition is false.
- Use else if to specify a new condition to test, if the first condition is false.
What is $9 in shell script?
$9 are positional parameters, with $0 pointing to the actual command, program, shell script, or function and $1, $2, $3, $9 as the arguments to the command.
What is if $1 in shell script?
$1 is the first command-line argument passed to the shell script. Also, know as Positional parameters. For example, $0, $1, $3, $4 and so on. If you run ./script.sh filename1 dir1, then: $0 is the name of the script itself (script.sh)
What is $0 in bash script?
Usage of $0 in a Bash Script in Ubuntu 20.04: $0 belongs to a different category of special variables in Bash, also known as positional parameters. These parameters range from $0 to $9, and as their name implies, these variables correspond to different values within a Bash script depending on their positions.
