利用直接执行的方式来执行 script 直接指令下达 (不论是绝对路径/相对路径还是 ${PATH} 内),或者是利用bash (或 sh) 来下达脚本时, 该 script 都会使用一个新的 bash 环境来执行脚本内的指令。 也就是说,使用这种执行方式时, 其实 script 是在子程序的 bash 内执行。 需要注意的是:重点在于:『当子程序完成后,在子
Of course, if this was something that you would repeatedly do, you should run it from a script, use proper names for the variables, and all those good practices (including transforming the filename in an argument and defining where to send the output, but today, the topic iswhileloops)....
text pulled from a file, the output of another Bash command, or parameters passed via the command line. Converting this loop structure into a Bash script is also trivial. In this article, we show you some examples of how aforloop can make you look like...
[root@www shell-script]# cat c_for02.sh#!/bin/bashfor((i=1,j=100;i<=10;i++,j--))doecho"i=$ij=$j"done 1. 2. 3. 4. 5. 6. for的无限循环 #!/bin/bashfor((i=0;i<1;i+=0))doecho"infinite loop"done 1. 2. 3. 4. 5. while循环 和for循环一样,while循环也是一种运...
用脚本的循环关键字 for, while 例如 每秒显示一段文字 # for i in {1..10}; do echo -n "This is a test in loop $i "; date ; sleep 1; done 用for循环脚本定时执行 有for一般都会有while支持,例如 # while true; do echo -n "This is a test of while loop";date ; sleep 5; done...
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; ...
#!/bin/bash while true do if [ `date +%H` -ge 17 ]; then exit # exit script fi echo keep running ~/bin/process_data # do some work done 如果要退出循环而不是退出脚本,请使用 break 命令而不是 exit。 #!/bin/bash while true do if [ `date +%H` -ge 17 ]; then break # exit...
Linux Bash Script loop syntax All In One shell 编程之流程控制 for 循环、while 循环和 until 循环 for forvarinitem1 item2 ... itemNdocommand1 command2 ... commandNdone forvarinitem1 item2 ... itemN;docommand1; command2…done;
fruit=orange; and on the third and final iteration,fruit=pear. Once it has completed the loop, the script continues normal execution with the next command after thedonestatement. In this case, it ends by saying “Let’s make a salad!” to show that it has ended the loop, but not the...
if[-e/home/oicq/script/get_random_shm_key.sh] 判断文件大小是否为空 代码语言:javascript 代码运行次数:0 运行 AI代码解释 if[!-s ${REMOTE_FILE}]then SH_error_msg"${REMOTE_FILE} file is empty"return1fi 循环 For for循环的一般格式为: ...