Linux 如何根据第6个字段内容对行进行grep

我想知道如何根据mem使用情况过滤线路：我想只找到（RES mem使用）超过5GB的PID

明确地说，我有以下几行

20697 user    20   0  357m  24m  19m S 19.0  0.1 887:15.00 pulseaudio
13017 user    20   0 8381m 3.7g  35m S 127.7  7.9 803:11.96 MATLAB
12654 user    20   0 11.2g 6.1g  10m S 104.8 13.0 784:41.07 MATLAB
3088 user    20   0 17.4g  12g  11m S 101.0 26.3   2043:48 MATLAB
12548 user    20   0 8797m 3.5g  13m S 101.0  7.4 802:21.00 MATLAB
12785 user    20   0 8543m 3.6g  35m S 101.0  7.6 804:36.81 MATLAB
12909 user    20   0 12.1g 5.5g  28m S 99.1 11.8 796:01.45 MATLAB
13154 user    20   0 10.1g 5.6g  10m S 99.1 11.8 797:07.14 MATLAB

我只想grep第6个字段大于5GB的行

编辑：注意排序并不重要。仅选择超出阈值的行非常重要

---

谢谢

不能从命令行使用排序选项，但可以使用变通方法来完成此操作

• 启动顶部（正常模式）
• 设置顺序（按存储器顺序：O n）
• 写入配置文件（W）
• 退出顶部

• 使用流输入和grep
• 对于订购或其他操作，请选择awk

---

如果您不介意使用awk

$ cat n.txt
20697 user    20   0  357m  24m  19m S 19.0  0.1 887:15.00 pulseaudio
13017 user    20   0 8381m 3.7g  35m S 127.7  7.9 803:11.96 MATLAB
12654 user    20   0 11.2g 6.1g  10m S 104.8 13.0 784:41.07 MATLAB
3088 user    20   0 17.4g  12g  11m S 101.0 26.3   2043:48 MATLAB
12548 user    20   0 8797m 3.5g  13m S 101.0  7.4 802:21.00 MATLAB
12785 user    20   0 8543m 3.6g  35m S 101.0  7.6 804:36.81 MATLAB
12909 user    20   0 12.1g 5.5g  28m S 99.1 11.8 796:01.45 MATLAB
13154 user    20   0 10.1g 5.6g  10m S 99.1 11.8 797:07.14 MATLAB

$ awk '{if($6>=5) {print}}' n.txt
12654 user    20   0 11.2g 6.1g  10m S 104.8 13.0 784:41.07 MATLAB
12909 user    20   0 12.1g 5.5g  28m S 99.1 11.8 796:01.45 MATLAB
13154 user    20   0 10.1g 5.6g  10m S 99.1 11.8 797:07.14 MATLAB

---

使用

gawk

：

$ cat n.txt
20697 user    20   0  357m  24m  19m S 19.0  0.1 887:15.00 pulseaudio
13017 user    20   0 8381m 3.7g  35m S 127.7  7.9 803:11.96 MATLAB
12654 user    20   0 11.2g 6.1g  10m S 104.8 13.0 784:41.07 MATLAB
3088 user    20   0 17.4g  12g  11m S 101.0 26.3   2043:48 MATLAB
12548 user    20   0 8797m 3.5g  13m S 101.0  7.4 802:21.00 MATLAB
12785 user    20   0 8543m 3.6g  35m S 101.0  7.6 804:36.81 MATLAB
12909 user    20   0 12.1g 5.5g  28m S 99.1 11.8 796:01.45 MATLAB
13154 user    20   0 10.1g 5.6g  10m S 99.1 11.8 797:07.14 MATLAB

$ gawk '
BEGIN{
    k=1024;
    m["k"]=k;
    m["m"]=k*k;
    m["g"]=k*k*k;
}
{
    patsplit($6, a, "([0-9.]*)|([kmg])");
    value=a[1]*m[a[2]];
    if (value>5*k*k*k) print;
}' n.txt 

12654 user    20   0 11.2g 6.1g  10m S 104.8 13.0 784:41.07 MATLAB
3088 user    20   0 17.4g  12g  11m S 101.0 26.3   2043:48 MATLAB
12909 user    20   0 12g 5.5g  28m S 99.1 11.8 796:01.45 MATLAB
13154 user    20   0 10.1g 5.6g  10m S 99.1 11.8 797:07.14 MATLAB

更优化（不太通用）的版本：

---

3088用户20 0 17.4g 12g 11m S 101.0 26.3 2043:48 MATLAB

也应该被打印出来。几乎，它需要首先选择第6个字段以“g”结尾，然后确保其值大于5。既然它已经转换了顶部的大小，为什么还要进行转换呢？你可以搜索g。如果它在最后说m，那么它比gig还小，所以你的转换是对cpu的浪费。有什么错误吗？全部/无）？谢谢。短小而优雅。

$ cat n.txt
20697 user    20   0  357m  24m  19m S 19.0  0.1 887:15.00 pulseaudio
13017 user    20   0 8381m 3.7g  35m S 127.7  7.9 803:11.96 MATLAB
12654 user    20   0 11.2g 6.1g  10m S 104.8 13.0 784:41.07 MATLAB
3088 user    20   0 17.4g  12g  11m S 101.0 26.3   2043:48 MATLAB
12548 user    20   0 8797m 3.5g  13m S 101.0  7.4 802:21.00 MATLAB
12785 user    20   0 8543m 3.6g  35m S 101.0  7.6 804:36.81 MATLAB
12909 user    20   0 12.1g 5.5g  28m S 99.1 11.8 796:01.45 MATLAB
13154 user    20   0 10.1g 5.6g  10m S 99.1 11.8 797:07.14 MATLAB

$ gawk '
BEGIN{
    k=1024;
    m["k"]=k;
    m["m"]=k*k;
    m["g"]=k*k*k;
}
{
    patsplit($6, a, "([0-9.]*)|([kmg])");
    value=a[1]*m[a[2]];
    if (value>5*k*k*k) print;
}' n.txt 

12654 user    20   0 11.2g 6.1g  10m S 104.8 13.0 784:41.07 MATLAB
3088 user    20   0 17.4g  12g  11m S 101.0 26.3   2043:48 MATLAB
12909 user    20   0 12g 5.5g  28m S 99.1 11.8 796:01.45 MATLAB
13154 user    20   0 10.1g 5.6g  10m S 99.1 11.8 797:07.14 MATLAB

$ awk '$6 ~ /^[0-9.]*g$/{if((0 + $6)>5) print}' n.txt

$ awk '$6~/g/ && ($6+0)>5' file
12654 user    20   0 11.2g 6.1g  10m S 104.8 13.0 784:41.07 MATLAB
3088 user    20   0 17.4g  12g  11m S 101.0 26.3   2043:48 MATLAB
12909 user    20   0 12.1g 5.5g  28m S 99.1 11.8 796:01.45 MATLAB
13154 user    20   0 10.1g 5.6g  10m S 99.1 11.8 797:07.14 MATLAB