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如何并行bash for循环

gnu-parallel bash

0

user1980099 · 技术社区 · 4 年前

如何让这个循环使用并行linux命令?

 func() {
     ssh -q $cn "systemctl restart ntpd"
 }

 
 for num in $(seq 30 40) ; do
    num_tmp=$(printf "%03d" $num)
    cn="node$num_tmp"    
    func
done | parallel

我试着在循环的末尾添加parallel,但它不起作用

0 回复 | 直到 4 年前

1

Mark Setchell 4 年前

像这样也许:

seq -f "%03G" 30 40 | parallel --dry-run 'ssh -q node{} "systemctl restart ntpd"'

样本输出

ssh -q node030 "systemctl restart ntpd"
ssh -q node031 "systemctl restart ntpd"
ssh -q node032 "systemctl restart ntpd"
ssh -q node033 "systemctl restart ntpd"
ssh -q node034 "systemctl restart ntpd"
ssh -q node035 "systemctl restart ntpd"
ssh -q node036 "systemctl restart ntpd"
ssh -q node037 "systemctl restart ntpd"
ssh -q node038 "systemctl restart ntpd"
ssh -q node039 "systemctl restart ntpd"
ssh -q node040 "systemctl restart ntpd"

或者,如果您有bash v4或更新版本,它可以为您设置零填充:

parallel --dry-run 'ssh -q node{} "systemctl restart ntpd"' ::: {030..040}

2

0

Kaan 4 年前

添加此“&”以结束func;

 .....
    cn="node$num_tmp"    
    func &
done