http://stackoverflow.com/questions/3043978/bash-how-to-check-if-a-process-id-pid-exists https://bugzilla.redhat.com/show_bug.cgi?id=835838
http://stackoverflow.com/questions/3043978/bash-how-to-check-if-a-process-id-pid-exists https:///show_bug.cgi?id=835838
在Bash中,可以使用条件语句来检查变量是否在范围内。 要检查变量是否在范围内,可以使用if语句结合比较运算符和逻辑运算符来实现。下面是一个示例代码: 代码语言:txt 复制 #!/bin/bash # 定义范围的上下限 lower_limit=10 upper_limit=20 # 要检查的变量 num=15 # 使用if语句检查变量是否在范围内 if [[ $nu...
并使用`bg`命令将其放入后台运行。例如，如果想要唤醒名为`bash_process_name`的bash进程，可以使用以下...
# checkqueue.pywhile True: check_queue() do_something()我如何编写一个bash脚本来检查它是否正在运行，如果没有，则启动它。大致如下伪代码（或者它应该做一些类似 ps | grep 的事情？）# keepalivescript.shif processidfile exists:if processid is running:exit, all okrun checkqueue.pywrite process...
c 面向对象：JAVA，Python，perl，C++ bash:脚本解释器 编程能力： 脚本编程 变量：内存空间，...
" ## Check whether a filename was entered if [ -n "$filename" ] then if [ $verbose -gt 0 ] then printf "Filename is %s\n" "$filename" fi else if [ $verbose -gt 0 ] then printf "No filename entered\n" >&2 fi exit 1 fi ## Check whether file exists if [ -f "$...
Here you try to regularly kill (TERM signal) the process nicely after 10.0 seconds after it has started. If it's still running after 20.0 seconds, then send a KILL signal (kill -9). If in doubt, check which signals are supported in your system (kill -l, for example). ...
- Test if the specified variable has a [n]on-empty value: [[ -n $variable ]] - Test if the specified variable has an empty value: [[ -z $variable ]] - Test if the specified [f]ile exists: [[ -f path/to/file ]] - Test if the specified [d]irectory exists: ...
As you can see the filemath.shexists! Most of the time when you’re writing bash scripts you won’t be comparing two raw values or trying to find something out about one raw value, instead you’ll want to create a logical statement about a value contained in a variable. Variables behav...