”while” 语句就会执行 while [ condition ] do command1 command2 command3 done 或者...
i=1while[$i-le6]douseradd user$i echo"成功创建用户 user$i"leti++done #!/bin/bash :此行指定用于运行脚本的解释器,在本例中为 Bash。 i=1 :该行用值 1 初始化变量 i 。 while [ $i -le 6 ] :此行启动 while 循环,只要 i 的值小于或等于 6,该循环就会继续。 useradd user$i :在循环...
/bin/bashIFS_OLD=$IFSIFS=$'\n'forentryin$(cat/etc/passwd)doecho"entry:$entry"IFS=:forvaluein$entrydoecho"$value"donedoneIFS=$IFS_OLD 四、控制循环 break命令终止循环。 #!/bin/bashforvarin1 2 3 4 5 6 7 8 9 10doif[$var-eq 5 ]thenbreakfiecho$vardone #!/bin/bashvar=1while[$...
while循环 bash 循环结构 原创 云丽周阿 2024-02-23 11:14:58 82阅读 linux while循环 while循环的格式while expressiondocommandcommand```done1、计数器控制的while循环#!/bin/shint=1while(( $int<=5 ))doecho $intlet "int++"done2、结束标记控制的while循环 #用脚本演示使用结束标记控制while循环实...
bash shell while语法 在编写脚本时,一定要注意空格 基本语法: while[condition]docommand1 command2 command3done condition为true时命令1到命令3将会一直执行,知道条件为false ,例如: #!/bin/bashx=1while[$x-le5]doecho"Welcome $x times"x=$(($x+1))done...
#!/bin/bash while inotifywait -e modify /path/to/file do echo "File changed" done 使用事项 while循环的语法为:while test command;do;done。 test command是测试条件的命令,可以是任何Linux命令或逻辑表达式。 while循环中的代码块必须用do和done包围。 在循环内部需要使用变量时,变量名前必须加上$符号。
(2)until语法:until command do list done (3)for语法:for name in word1 word2…wordN do list done 例:输出1~10。 #!/bin/sh x=1 for x in 1 2 3 4 5 6 7 8 9 10 do echo $x done (4)select语法:select name in word1 word2…wordN ...
while :docommanddonebreak 跳出循环eg：[root@dl-001 sbin]# vim break.sh#!/bin/bashfor i in `seq 1 5`doecho "$i"if [ $i -eq 3 ]thenbreakfiecho "$i"doneecho "Finished!"[root@dl-001 sbin]# sh break.sh Finished!参考资料来源：while-百度百科Break-百度百科 ...
Command output retention while counting lines Ask Question Asked 6 years, 4 months ago Modified 6 years, 4 months ago Viewed 161 times 1 I was reading Count number of lines of output from previous program and found it helpful. However, while$...
Always be clear about what is the condition toendthe loop. If that is something that you expect to do yourself with aCTRL-C, then keep an eye on your command. Think abouthow fastyou want each loop cycle to be repeated. If you do any operation that involves I/O inside the loop, tha...