The customer is running a pipeline command, when using "echo $?", only the return value of last command could be got, how to get the return value from the second command? Raw # df |awk '{print $5}' |grep /mnt 2>&1 | tee ./log; echo $? 1 ...
首先,Shell 是一个程序,提供一个与用户对话的环境。这个环境只有一个命令提示符,让用户从键盘输入命令,所以又称为命令行环境(commandline,简写为 CLI)。Shell 接收到用户输入的命令,将命令送入操作系统执行,并将结果返回给用户。本书中,除非特别指明,Shell 指的就是命令行环境。 其次,Shell 是一个命令解释器,解释...
While ShellCheck is mostly intended for interactive use, it can easily be added to builds or test suites. It makes canonical use of exit codes, so you can just add ashellcheckcommand as part of the process. For example, in a Makefile: check-scripts:# Fail if any of these files have w...
echo "value of var2:"$2 echo "value of var3:"$3 echo "value of var4:"$4 保存文件名为 my.sh,执行时传入参数:#sh my.sh a b c d e(回车),看到结果你就会更清楚各个变量的意思。如果访问的参数在执行时没有传入,如有一条这样的代码: echo "value of var4:"$100 而在执行时并没有输入1...
Get the last value in the array. ${array[@]} Expand all of the array elements. shift Move argument from $2 to $1. function() { content-of-function } Used to define a function. alias Used to list all aliases defined in the current session. alias alias='any command' Used to define...
it returned a1, which was the return value ofbadcommand. But theechocommand itself succeeds, and therefore the new, most recent status is success (i.e., a0value).Because you only get one chance to check the exit status, many shell scripts will immediately assign the status to another ...
问BASH -告诉是否存在重复行(y/n)EN我要做的第一件事是检查是否存在重复的条目，如果存在，询问用户...
simple command 簡單命令的返回值是它的退出狀態, 或是 128+n, 如果命令被 signal(信號) n 結束的話. Pipelines 管道 pipeline(管道) 是一個或多個命令的序列,用字符 | 分隔。管道的格式是這樣: [time [-p]] [ ! ] command [ | command2 ... ] 命令 command 的標準輸出通過管道連接到命令 command2...
simple command 簡單命令的返回值是它的退出狀態, 或是 128+n, 如果命令被 signal(信號) n 結束的話. Pipelines 管道 pipeline(管道) 是一個或多個命令的序列,用字符 | 分隔。管道的格式是這樣: [time [-p]] [ ! ] command [ | command2 ... ] 命令 command 的標準輸出通過管道連接到命令 command2...
kubernetes 即使不满足条件也执行函数体时执行Bash [重复]此if条件 如果“$status”！=“正在运行”||...