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 belo...
Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article,...
Now lets show specific examples of the basic variations of theIFELIFandELSEconditions in working examples below. Example 1: If statement in bash on string equality #!/bin/bash read-p"Enter a match word: "USER_INPUT if[[$USER_INPUT=="hello"]];then ...
Create a file named ‘simple_if.sh’ with the following script to know the use if statement in bash. Here, 10 is assigned to the variable, n. if the value of $n is less than 10 then the output will be “It is a one digit number”, otherwise the output will be “It is a two...
[ s1 ] (true if s1 is not empty, else false) [ -n s1 ] (true if s1 has a length greater then 0, else false) [ -z s2 ] (true if s2 has a length of 0, otherwise false) Example Script number.sh #!/bin/bash echo -n “Enter a number 1 < x < 10: " ...
Now, let's create an example scriptroot.sh.This script will echo the statement “you are root” only if you run the script as the root user: #!/bin/bash if [ $(whoami) = 'root' ]; then echo "You are root" fi Thewhoamicommand outputs the username. From thebash variables tutorial...
A Shell script usually needs to test if a command succeeds or a condition is met. In Bash, this test can be done with a Bash if statement. As with any other programming language, Bash comes with conditional expressions that allow you to test for conditions and alter the control flow if ...
bash shell if-statement while-loop m3u 我正在编写一个脚本来解析m3u文件。目标是检索变量标记和url。我用这个文件做了测试。 #!/bin/bash echo "name,tvg-id,tvg-name,tvg-country,group-title,languages,url" while IFS= read -r line; do tags_detect="$(echo "$line" | grep -Eo '^#EXTINF:')...
If you want to learn the fundamentals of bash scripting, read this article to find 25 bash scripting examples.
echo "* end of script *" The following is the output of the script. Example 03 - Conditional statements with IF Here, we use a simple if statement to check if a file is available. We can easily understand the syntax of a bash ‘if statement’ as with a normal programming language....