用于检查多个正在运行的进程的 Bash 脚本
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Bash script to check multiple running processes
提问by Citizen SP
I'm made the following code to determine if a process is running:
我编写了以下代码来确定进程是否正在运行：
#!/bin/bash
ps cax | grep 'Nginx' > /dev/null
if [ $? -eq 0 ]; then
echo "Process is running."
else
echo "Process is not running."
fi
I would like to use my code to check multiple processes and use a list as input (see below), but getting stuck in the foreach loop.
我想使用我的代码检查多个进程并使用列表作为输入（见下文），但卡在 foreach 循环中。
CHECK_PROCESS=nginx, mysql, etc
What is the correct way to use a foreach loop to check multiple processes?
使用 foreach 循环检查多个进程的正确方法是什么？
回答by gniourf_gniourf
If your system has pgrepinstalled, you'd better use it instead of the greping of the output of ps.
如果你的系统已经pgrep安装了，你最好用它代替的grep输出的ING ps。
Regarding you're question, how to loop through a list of processes, you'd better use an array. A working example might be something along these lines:
关于您的问题，如何遍历进程列表，最好使用数组。一个工作示例可能是这样的：
(Remark: avoid capitalized variables, this is an awfully bad bash practice):
（备注：避免大写变量，这是一种非常糟糕的 bash 实践）：
#!/bin/bash
# Define an array of processes to be checked.
# If properly quoted, these may contain spaces
check_process=( "nginx" "mysql" "etc" )
for p in "${check_process[@]}"; do
if pgrep "$p" > /dev/null; then
echo "Process \`$p' is running"
else
echo "Process \`$p' is not running"
fi
done
Cheers!
干杯!
回答by dimir
Create file chkproc.sh
创建文件 chkproc.sh
#!/bin/bash
for name in $@; do
echo -n "$name: "
pgrep $name > /dev/null && echo "running" || echo "not running"
done
And then run:
然后运行：
$ ./chkproc.sh nginx mysql etc
nginx: not running
mysql: running
etc: not running
Unless you have some old or "weird" system you should have pgrepavailable.
除非你有一些旧的或“奇怪的”系统，否则你应该有pgrep可用。
回答by P.P
Use a separated list of of processes:
使用单独的进程列表：
#!/bin/bash
PROC="nginx mysql ..."
for p in $PROC
do
ps cax | grep $p > /dev/null
if [ $? -eq 0 ]; then
echo "Process $p is running."
else
echo "Process $p is not running."
fi
done
If you simply want to see if either one of them is running, then you don't need loo. Just give the list to grep:
如果您只是想查看它们中的任何一个是否正在运行，那么您不需要 loo. 只需将列表提供给grep：
ps cax | grep -E "Nginx|mysql|etc" > /dev/null
