bash_getstarttime $ROOTPID function runonexit (){ rm /dev/shm/${USER}.bashtime.${ROOTPID} } trap runonexit EXIT PS0='$(bash_getstarttime $ROOTPID)' PS_time='↑$(bash_getstoptime $ROOTPID)s↑ ' # PS1="\u@\h \w> " PS1="$PS_time""$PS1" Linux: 检查bash的版本,如果低于...
You may need to perform the function testing several times. The first time you run it, you will likely find some errors in your scripts or in the procedures. Therefore, to avoid wasting too much time in recreating the server environment from scratch -- especially if a database is involved ...
\6. 你也可以作为域分隔符,比如环境变量$PATH中,或者passwd中,都有冒号的作为域分隔符的存在; \7. 你也可以将冒号作为函数名,不过这个会将冒号的本来意义转变(如果你不小心作为函数名,你可以使用unset -f : 来取消function的定义)。 12. ! 感叹号-取反 感叹号(reverse (or negate) [bang],[exclamation mar...
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...
1. Run the bash shell in debugger mode: bash --debuggerCopy 2. Check the function's source file with: declare -F <function name>Copy For example: declare -F my_functionCopy The output prints the function's name, the line number, and the file location where the function definition is....
Incorrect use of a compound command when defining a Bash Function Runtime ErrorA Runtime Error will be the next level of errors. The shell script runs with no syntax errors but fails to execute reliably certain tasks. The most common runtime errors in a shell script include: Division by ze...
n is the exit status of n. If n is omitted,the exit status is that of the last command executed. Post function A function can be called on a EXIT before the shell terminates. Example: by calling the exit function, the following finish function will run thanks to the registration of...
It will stop the function execution once it is called. You can use the return builtin command to return an arbitrary number instead. Syntax: return [n] where n is a number. If n is not supplied, then it will return the exit code of the last command run....
exit(1) # 结束程序,$? => 1 subprocess.run( # 创建用户 'useradd %s' % user, shell=True ) subprocess.run( # 添加密码 'echo %s | passwd --stdin %s' % (password, user), shell=True ) with open(fname,'a') as fobj: # 将用户名和密码写入文件 ...
dockerfile RUN apt-get update...install -y build-essential curl vim git && apt-get clean && rm -rf /var/lib/apt/lists/* 使用set -e命令,在命令失败时立即退出...: dockerfile RUN echo "执行一些命令" || exit 1 结论通过掌握这些技巧,我们可以开发出高效且可靠的Dockerfile,优化构建过程,确保...