Bash超级会 - 5.LOOP 每种编程语言都有 loop 操作,在 bash script 中,有两种 loop 。 while 没数的时候就用While吧,没数但必须说一个条件。 #!/bin/bash i=0 while [ $i -le 4 ] do echo Number: $i ((i++)) done for 数数或者数list。 #!/bin/bash i=2 for (( counter=1; counter<...
You can have awhileloop to keep checking for that directory's existence and only write a message while the directory does not exist. If you want to do something more elaborate, you could create a script and show a more clear indication that the loop condition became true: #!/bin/bashwhi...
在Bash中,可以使用while循环来创建变量列表中的一行。while循环是一种迭代结构,可以重复执行一系列命令,直到满足指定条件为止。 下面是一个示例,演示如何使用while循环创建变量列表中的一行: 代码语言:bash 复制 #!/bin/bash # 创建一个包含多个变量的列表 variable_list=("变量1" "变量2" "变量3" "变量4")...
在Bash中,可以使用循环命令来重复执行一系列的命令。常见的循环命令有for循环、while循环和until循环。 对于if分支之外的循环命令,可以使用while循环或者until循环来实现。下面是它们的使用示例: while循环: 代码语言:txt 复制 while [ condition ] do # 循环执行的命令 done 在while循环中,当满足条件condition时,...
echo "We have completed the while loop since $number is greater than 10." while循环的结果如下: [zexcon@fedora ~]$ ./learnToScript.sh We checked the current number is 1 so we will increment once We checked the current number is 2 so we will increment once ...
所以,bash script是只能在bash环境下运行的script。 如何运行bash script 学习一门新语言最开始最想知道的必然是如何运行了。当然运行前得检查环境。 $echo$SHELL/bin/bash 如果已经是bash,那就没问题了,说明已经在bash环境了。如果不是bash,那么为了告诉shell,“请用bash来理解我的script”,我们需要首先找到bash: ...
You can easily evaluate the options passed on the command line for a script using while loop: ... .. while getopts ae:f:hd:s:qx: option do case "${option}" in a) ALARM="TRUE";; e) ADMIN=${OPTARG};; d) DOMAIN=${OPTARG};; f) ...
while read line do # use $line variable to process line echo $line done exec 0<&3 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. You can easily evaluate the options passed on the command line for a script using while loop:
Linux Bash Script loop shell 编程之流程控制 for 循环、while 循环和 until 循环 for var in item1 item2 ... itemN do command1 command2 ... commandN done 1. 2. 3. 4. 5. 6. 7. for var in item1 item2 ... itemN; do command1; command2… done; ...
Normally aforeachloop is used with the syntax,foreach n ( 1...5 ). However, the'foreach'loop is not supported in Bash. Due to this you must use a'for'loop orwhileloop. Here’s a simple example: for i in {1..5}; do echo $i; done ...