I made a script to check tnsping but the if statement does not working properly. The following is the script: ping=$(tnsping oracle1 |grep OK| awk -F" " '{print $1 }') if [ -n $ping ] then echo "OK" else echo "NOT OK" fi If a execute change oracle for a non-existing...
Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article,...
In this example, the script first checks if ‘a’ is greater than ‘b’. If it’s not, it moves on to the ‘elif’ statement to check if ‘a’ is greater than ‘c’. If neither condition is met, it executes the ‘else’ statement, which in this case, prints ‘a is not greate...
Check to see if a variable is empty or not Create a new bash file, named, and enter the script below. The script above stores the first command-line argument in a variable and then tests the argument in the next statement. This script will print the first argument because it is not em...
A Shell script usually needs to test if a command succeeds or a condition is met. In Bash, this test can be done with a Bash if statement. As with any other programming language, Bash comes with conditional expressions that allow you to test for conditions and alter the control flow if ...
bash shell if-statement while-loop m3u 我正在编写一个脚本来解析m3u文件。目标是检索变量标记和url。我用这个文件做了测试。 #!/bin/bash echo "name,tvg-id,tvg-name,tvg-country,group-title,languages,url" while IFS= read -r line; do tags_detect="$(echo "$line" | grep -Eo '^#EXTINF:')...
I don't understand why the if statement is not working in my applescript version. Am I quoting something wrong? This script uses a program called Translate-Shell which can be found on GitHub or at the program author's website here. applescript bash Share Improve this question Follow ...
An if statement checks if the length of '$input_str' is zero using the -z test operator. If the string is empty, the script prints "The string is empty" using the "echo" command. If the string is not empty, the script prints "The string is not empty". ...
If statement inside command line Ask Question Asked 11 years, 8 months ago Modified 11 years, 8 months ago Viewed 111 times 0 I'm trying to create a shell script and the fact is, I want to change the output if the variable $output is filled. I was thinking about checking the variable...
Usually, Syntax Errors are the easiest errors to solve in a Bash script. They can often be found without executing the shell script. The most common syntax errors include: Improper use of square brackets or parentheses in a Bash If Statement Incorrect syntax when using a Bash Loop or a ...