能够用keyword” break ” 用来跳出循环;也能够用keyword” continue ”用来不运行余下的部分而直接跳到下一个循环。 实例3-4-1 #!/bin/sh num=10 while [ ! “$num” = “0” ]; do #num=num-1 num=`expr “$num” “-” “1”` echo $num done 3.5、fo
while循环会在测试条件不再成立时停止。 后面还有例子用到数值比较: 3.2 使用多个测试命令 while命令允许你在while语句行定义多个测试命令。只有最后一个测试命令的退出状态码会被用来决定什么时候结束循环。 #!/bin/bash # testing a multicommand while loop var1=10 while echo $var1 [ $var1 -ge 0 ] #wh...
while[condition]dostatements1#Executedaslongascondition istrueand/or, up to a disaster-conditionifany.statements2if(disaster-condition)thenbreak#Abandon thewhilelopp.fistatements3#While good and, no disaster-condition.done In this example, the break statement will skip the while loop when user ente...
Explanation: In the above example, whenever the value of $j reaches 3, it terminates the current loop, and execution moves to the parent loop. So, here Break command is executed twice as per the condition. Example #5 – Break Statement in Outer Loop Code: $i = 1 while($i -lt 5){...
The Bourne shell’s while loop uses exit codes, like the if conditional. For example, this script does 10 iterations: Bourne shell 的 while 循环使用退出代码,就像 if 条件一样。例如,此脚本进行了 10 次迭代: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #!/bin/sh FILE=/tmp/whiletest....
Linux shell while循环语句 for :明确循环次数 while :不确定循环换次数 while循环 (1) while CONDITION;do statement statement <改变循环条件真假的语句> done 编写脚本,计算1--100的和 编写while...用Ping、Tcping测试网络的连通性 1、概述 通常情况下,测试一个地址能不能访问,通常使用Ping来判断,如果测试...
-exec foo {} && bar {} \; # Prematurely terminated find -exec sudo echo 'Var=42' > /etc/profile # Redirecting sudo time --format=%s sleep 10 # Passing time(1) flags to time builtin while read h; do ssh "$h" uptime # Commands eating while loop input alias archive='mv $1 /...
while($val -ne 3) { $val++ Write-Host $val } In this example, the condition ($val is not equal to 3) is true while $val is equal to 0, 1, and 2. Each time through the loop, $val is incremented by 1 using the ++ unary increment operator. The last time through the loop ...
In a Do-While loop, the condition is evaluated after the script block has run. As in a while loop, the script block is repeated as long as the condition evaluates to true. Like a Do-While loop, a Do-Until loop always runs at least once before the condition is evaluated. However, ...
/bin/bash3# another example of how not to use theforcommand4fortestinNevada New Hampshire New Mexico New York North Carolina5do6echo"Now going to $test"7done8$ ./badtest19Now going to Nevada10Now going to New11Now going to Hampshire12Now going to New13Now going to Mexico14Now going ...