In this tutorial, we’ll explore different ways to check if a number is prime in Bash. 2. Using factor The GNU Coreutils package provides the factor command for obtaining the prime factors of a natural number: $ factor 24 24: 2 2 2 3 $ factor 5 5: 5 A prime number only has itsel...
您可以在 C 风格的 for 循环中包含条件语句。在下面的示例中,我们包含了一个 if-else 语句,用于检查并打印出 1 到 7 之间的偶数和奇数。 #!/bin/bash for (( n=1; n<=7; n++ )) do # Check if the number is even or not if (( $n%2==0 )) then echo "$n is even" else echo "$...
您可以在 C 风格的 for 循环中包含条件语句。在下面的示例中,我们包含了一个 if-else 语句,用于检查并打印出 1 到 7 之间的偶数和奇数。 #!/bin/bashfor(( n=1; n<=7; n++ ))do# Check if the number is even or notif(($n%2==0))thenecho"$nis even"elseecho"$nis odd"fidone 使用“Co...
Here, the -c option counts the number of matches, and the result is checked with an if statement. If the count is 0, the script outputs the message No match found to the console using the echo command. Otherwise, Match found is printed. In the above example, the pattern was not ...
/bin/bash # Calculate the week number using the date command: WEEKOFFSET=$[ $(date +"%V") % 2 ] # Test if we have a remainder. If not, this is an even week so send a message. # Else, do nothing. if [ $WEEKOFFSET -eq "0" ]; then echo "Sunday evening, put out the ...
# Calculate the week number using the date command: WEEKOFFSET=$[ $(date +"%V") % 2 ] # Test if we have a remainder. If not, this is an even week so send a message. # Else, do nothing. if [ $WEEKOFFSET -eq "0" ]; then ...
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1 done } cmd_with_process() { $1 & pid=$! process $pid & wait $pid if [ $? -eq 0 ]; then echogreen "[ok]" else echo_red "[fail]" fi } case $ in check_cmd) shift cmd_with_process"$*" ;; *) echo_blue "Usage $0 [check_services|check_cmd]" echo_yellow "For...
Check number of arguments and which arguments were passed in bash So if you want to find the number of arguments including which arguments were passed to the script, here you have it. And I will walk you through three ways to do see the arguments passed to the bash script: ...
也就是写为if [ number1 \> number2 ]。 可以看到,使用if ((number1 > number2))这个写法更加简单方便,可以避免不加空格、或者不转义带来的异常。 执行arth_check.sh脚本,结果如下: $ ./arth_check.sh 1 2 1 < 2 $ ./arth_check.sh 2 1 ...