Another way to create the bash infinite loop is by using the until loop. The until loop iterates through a block of commands as long as the required condition becomes false. The until loop becomes infinite when the condition in the statement of the loop is always false. The infinite until ...
Using for loop in {START..END..INCREMENT} range Another use offor-inloop is to read range array. In the following example, a for loop is used to read a range of data from 10 to 30 which is incremented by 5 in each step. Next, the script will print those numbers in the range th...
三元表达式bash for循环语法这种for循环与C编程语言有一个共同的传统。...${countNameservers} nameservers defined in ${file}" break fidone 使用continue语句若要继续封闭FOR、WHILE或UNTIL循环的下一个迭代...总结您通过各种示例学习了如何使用bash for loop。 For循环可以节省时间,并可以帮助您自动完成微小的...
For example, let us use the continue statement to iterate through a range of number and when it reaches a specific number, which in this case will be ‘4’, the continue statement will exit the iteration and go back to the beginning of the loop to begin the next iteration. for i in...
for I in 1 2 3 4 5do statements1 #Executed for all values of ''I'', up to a disaster-condition if any. statements2 if (condition) then continue #Go to next iteration of I in the loop and skip statements3 fi statements3done 此脚本备份命令行中指定的所有文件名。如果.bak文件存在,它...
Loop invariant: vp->next == lp Loop postcondition: lp = list of words left after assignment statements skipped tlist = original list of words */ while (lp && (lp->word->flags & W_ASSIGNMENT))开始遍历一个命令中所有的,具有W_ASSIGNMENT属性的单词,遇到一个无该属性即结束循环 ...
Line 2: Marks the beginning of the for loop and iterate the variable n from 1 to 10. Line 4: Checks the value of n and if the variable is equal to 6, the script echoes a message to stdout and restarts the loop at the next iteration in line 2. ...
Bash For Loop 示例 1. 解压所有 Zip 文件 以下示例在根目录中查找与“*.zip*”匹配的文件列表,并在该 zip 文件所在的相同位置创建一个新目录,并解压缩该 zip 文件内容。 # cat zip_unzip.sh #! /bin/bash # Find files which has .zip for file in `find /root -name "*.zip*" -type f` do...
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
#8 0x08060a4a in reader_loop () at eval.c:152 #9 0x0805eae9 in main (argc=1, argv=0xbffff3d4, env=0xbffff3dc) at shell.c:749 (gdb) 2、管道组何时从waitchld 返回 在waitchld 函数中,它是通过waitpid(-1,……)来进行子进程的回收,也就是当管道中的所有子进程都被wait到之后bash才...