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4.4 需要更新,否则不支持PS0 ...
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...
# syntax.sh# Declaring functions using the reserved word function# Multilinefunctionf1 {echoHello I\'m function 1 echo Bye! } # One line function f2 { echo Hello I\'mfunction2;echoBye!; }# Declaring functions without the function reserved word# Multilinef3() {echoHello I\'m function 3...
Post function A function can be called on a EXIT before the shell terminates. Example: by calling the exit function, the followingfinishfunction will run thanks to the registration of the function via thetrap utility #!/bin/bashfunctionfinish{# Your cleanup code here}trapfinish EXIT Bash - Bu...
import atexit def my_function(): # 在退出npyscreen后要执行的代码 print("Exiting npyscreen...") atexit.register(my_function) 对于BASH命令的情况,可以使用Python的subprocess模块来执行命令。在注册函数时,可以使用subprocess.call()来执行BASH命令。例如: 代码语言:txt 复制 import atexit import subprocess def...
Let's see what the exit status was. $echo$?1 If we don't set an exit status explicitly, it's assumed to be0or it's the results of the last command that was run. Let's go in here. Let's see how exit statuses work with functions. I am going to create anokfunction. Instead ...
格式:trap "commands" EXIT 退出时执行commands指定的命令。( A trap on EXIT is executed before the shell terminates.) 退出码(exit status,或exit code)的约定: 0表示成功(Zero - Success) 非0表示失败(Non-Zero - Failure) 2表示用法不当(Incorrect Usage) ...
Find where a bash function is defined In many cases, it may be useful to find out where a function has been defined so you can either fix or update it. Though, either in the interactive or non-interactive mode, you can’t easily trace a specific function. In bash, you will need to...
退出shell的方式,exit或者ctrl-d均可,ctrl-d 的含义我们在信号章节继续讲。sudo 以另一个用户的身份执行命令sudo命令在很多方面都类似于su命令,不过管理员可以通过配置sudo命令,使系统以一种可控的方式,允许一个普通用户以一个不同的用户身份(通常是超级用户)执行命令。在特定情况下,用户可能被限制为只能执行一条...
trap 'printf \\e[2J\\e[H\\e[m' EXIT 忽略终端中断(CTRL + C,SIGINT) trap '' INT 对窗口调整大小做出反应 # Call a function on window resize. trap 'code_here' SIGWINCH 在每个命令之前做点什么 trap 'code_here' DEBUG 当shell函数或源文件完成执行时执行某些操作 ...