BASH，如果语句未按预期运行

如何解决BASH，如果语句未按预期运行

正如标题所说，我试图只回显早于 2600000 秒的进程，但它回显了 etimes 小于 2600000 的进程。

 while read pro; do
 set -- $pro

if [ $2 > 2600000 ]
 then
 echo $2 is bigger than 2600000
 echo "
PID :$1,Process owner :$3,procces begin time: $2 (Seconds ago)  
"
 fi
PIDS_OVER_A_MONTH+=("PID:$2,Process owner:$2")



done < <(ps -eo pid,etimes,user )

这是我的输出，如您所见，它回显小于 2600000 的 etimes（不要注意 PIDS_OVER... 列表）：

PID :25271,Process owner :yonatanh,procces begin time: 2082286 (Seconds ago)  

2082286 is bigger than 2600000

PID :25275,procces begin time: 2082286 (Seconds ago)  

2082284 is bigger than 2600000

PID :25299,procces begin time: 2082284 (Seconds ago)  

7224 is bigger than 2600000

PID :29549,Process owner :it,procces begin time: 7224 (Seconds ago)  

6843 is bigger than 2600000

PID :30225,procces begin time: 6843 (Seconds ago)  

2079327 is bigger than 2600000

PID :31324,procces begin time: 2079327 (Seconds ago) 

解决方法

几个推荐的更改：

• 使用 -gt 进行数值比较
• 添加 --no-headers 以取消 ps 标题行
• 将 ps 值直接读入变量

把这一切放在一起：

while read -r pid elapsed owner
do
    if [ "${elapsed}" -gt 2600000 ]
    then
        echo "${elapsed} is bigger than 2600000"
        printf "\nPID : ${pid},Process owner : ${owner},procces begin time : ${elapsed} (Seconds ago)\n\n"
    fi
    PIDS_OVER_A_MONTH+=("PID:${pid},Process owner:${owner}")
done < <(ps --no-headers -eo pid,etimes,user )

,

你确实说过bash，对吗？您需要可移植到其他解析器吗？

我会使用 bash。

while read -r pid etimes user; do
  if (( etimes > 2600000 )); then
     echo "$etimes is bigger than 2600000"
     printf "\nPID :%s,Process owner :%s,proccess begin time: %s (Seconds ago)  \n\n" "$pid" "$user" "$etimes"
     PIDS_OVER_A_MONTH+=("PID:$pid,Process owner:$user")
  fi
done < <(ps -eo pid,user ) 

数字上下文 (( )) 非常清楚。