BASH，if 语句未按预期运行

Question

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

 while read pro; do
 set -- $pro

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



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

这是我的输出，如您所见，它回显了小于 2600000 的 etimes（请注意 PIDS_OVER...列表）：

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

2082286 is bigger than 2600000

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

2082284 is bigger than 2600000

PID :25299, Process owner :yonatanh, 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, Process owner :yonatanh, procces begin time: 6843 (Seconds ago)  

2079327 is bigger than 2600000

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

Answer 1

一些建议的更改：

使用 -gt 进行数值比较
添加 --no-headers 以抑制 ps header 行
将ps值直接读入变量

综合考虑：

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 )

Answer 2

你说的是bash，对吧？您需要对其他解析器的可移植性吗？

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,etimes,user )

数字上下文 (( )) 非常清楚。

BASH，if 语句未按预期运行

BASH, if statement not operating as expected

linux

bash

process

ps