for i in 1 2 3 4; do echo $i; done 2、测试for的自增长的循环: #!/bin/bash for ((i=1; i<=5; i++)) do echo $i; done 如果会报错,没有则跳过: Syntax error: Bad for loop variable 原因:代码对于标准bash而言没有错,因为Ubuntu为了加快开机速度,用dash代替了传统的bash,是dash在捣鬼。
for i in {1..9};do for j in `seq $i`;do echo -en "$i*$j=$(($i*$j))\t" done echo done 1. 2. 3. 4. 5. 6. 8、在/testdir目录下创建10个html文件,文件名格式为数字N(从1到10)加随机8个字母,如:1AbCdeFgH.html for i in {1..10};do NUM=`openssl rand -base64 6|t...
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PowerShell 复制 # Regular expression to find the numerals in the filename, but only if the # numeral count is smaller than the longest numeral count. $pattern = $patternTemplate -f 1, ($longestNumeralCount - 1) for ( $i = 0 # Start at zero for first array item. $i -lt $fileLi...
for n in {1..7}; do echo $n done Once the shell script is executed, all the values in the range are listed, similar to what we had insimple loops. Bash For Loop with Ranges Example Additionally, we can include a value at the end of the range that is going to cause thefor loop...
已完成100 XP 7 分钟 执行管道时,管道中的命令会应用于每个对象。 在某些情况下,可能需要使用 ForEach-Object cmdlet 来处理管道中的数据。 将数据存储在数组中时,ForEach 构造支持处理数组中的每个项。 ForEach 构造使用以下语法: PowerShell ForEach($userin$users) {Set-ADUser$user-Department"M...
Don't use ls | grep. Use a glob or a for loop with a condition to allow non-alphanumeric filenames. 详见Wiki SC2010 针对这个问题,我本想尝试用files=$(ls -l "$dir/"* | wc -l)来解决,但是ls -l /direcotry/*打印出来的结果不尽如人意: ...
breakexits from afor,select,while, oruntilloop in a shell script. Ifnumberis given,breakexits from the given number of enclosing loops. The default value ofnumberis1. Usage Notes This is a special built-in command of the shell. Exit Values ...
If you don’t specify the keyword “in” followed by any list of values in the bash for loop, it will use the positional parameters (i.e the arguments that are passed to the shell script). $ cat for3.sh i=1 for day do echo "Weekday $((i++)) : $day" ...
Looping statements are used to force a program to repeatedly execute a statement. The executed statement is called the loop body. Loops execute until the value of a controlling expression is 0. The controlling expression may be any scalar data type. The