printf "Enter a number between 10 and 20 inclusive: " read number if (( number < 10 )) then printf "%d is too low\n" "$number" >&2 exit 1 elif (( number > 20 )) then printf "%d is too high\n" "$number" >&2 exit 1 else printf "You entered %d\n" "$number" fi 注...
However, the method can be made more efficient by using the fact that prime numbers greater than 3 can only take on the form 6k-1 or 6k+1 where k is a positive integer. This way, to test if a number, n, is prime for numbers greater than 3, we perform a series of steps: check...
#Check the input number [ $#-lt3] && {echo-e"Invalid input.\nUsage $(basename $0) Number1 Number2 Number3"; exit1; } #Get the input number and checkifit is a integer declare-a arrayforiin`seq02`;doif[[ $1=~ ^[0-9]+$ ]];thenarray[$i]=$1shiftelsearray[$i]=0echo-e"...
The proper way to handle errors is to check if the program finished successfully or not, using return codes. It sounds obvious but return codes, an integer number stored in bash$?or$!variable, have sometimes a broader meaning. Thebash man pagetells you: For the shell’s purposes, a comma...
问BASH getopt命令返回自己的参数，而不是命令行参数EN参考链接： Java命令行参数 -Xmixed 混合模式执行...
An "if" statement is used to check if the number is greater than 100. The condition [ "$n" -gt 100 ] checks if the value of '$n' is greater than 100. If the condition evaluates to true, the script prints "The number is greater than 100." using "echo". If the condition evalua...
The division operator (/) does not work as you might expect it to since 5 / 2 = 2.5. Bash doesinteger division, which means that the result of dividing one number by another is always rounded down to the nearest integer. Let’s take a look at a few examples on the command line: ...
echo "Input a number:" read n # Initialize variables factorial=1 ctr=1 # Check if the input is a non-negative integer if ! [[ "$n" =~ ^[0-9]+$ ]]; then echo "Error: Input a non-negative integer." exit 1 fi # Calculate factorial using a while loop ...
The$RANDOMvariable generates an integer between 0 and 32767. This is because$RANDOMuses a pseudo-random number generator that produces numbers in this range. This range is sufficient for many tasks, but what if you need a random number within a different range? Stay tuned, we’ll cover that...
echo "Result as rounded integer:" echo $userinput | bc 1. 2. 3. 4. 5. 6. 7. 8. 9. 18. Redirections 18.1. STDOUT from bash script to STDERR #!/bin/bash echo "Redirect this STDOUT to STDERR" 1>&2 To prove that STDOUT is redirected to STDERR we can redirect script's output...