shellErrHandle
shellErrHandle
概述
立即捕获
Automatic exit from Bash shell script on error [duplicate]
set -e
任何后续的脚本,一旦存在错误, 会立马退出
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#!/bin/bash
set -e
# Any subsequent(*) commands which fail will cause the shell script to exit immediately
|| 或的逻辑
Is there a TRY CATCH command in Bash
There is no try/catch in bash; however, one can achieve similar behavior using
&&
or||
.
command 1 || command 2
if command1 fails then command2 runs as follows
正是我需要的, 前边执行失败, 才会执行后边的命令
> Similarly, using&&
, command2 will runif command1 is successful
Exception handling in shell scripting?
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a_command || fallback_command
In this example, you want to run fallback_command if a_command fails (returns a non-zero value):
|| 失败才会执行 fallback_command
sed 如果匹配失败, 不会报错
有些异常不是异常
mac上遇到的错误sed command a expects followed by text
gsed替换sed
放弃捕获
Throw away standard output and error
{ ps -p "$proc" | fgrep "$proc";} >/dev/null 2>&1
效果,只输出echo内容
停止进程的错误理解
Linux后台进程管理以及ctrl+z(挂起)、ctrl+c(中断)、ctrl+\(退出)和ctrl+d(EOF)的区别
前台进程的终止: ctrl+c, 后台并没有终止
ctrl+c强行中断当前程序的执行。
ctrl+z将任务中断,但是此任务并没有结束,他仍然在进程中,只是放到后台并维持挂起的状态。
- 如需其在后台继续运行,需用“bg 进程号”使其继续运行;再用”fg 进程号”可将后台进程前台化。
ctrl+\表示退出。 复制成功
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