top相同輸出+相同sed過(guò)濾=不同結(jié)果

shahand

=====> 兩者結(jié)果一樣

# top -n 1 |grep Cpu
Cpu(s):  3.0%us,  0.3%sy,  0.0%ni, 96.5%id,  0.2%wa,  0.0%hi,  0.0%si,  0.0%st

# top -n 1 -b |grep Cpu
Cpu(s):  3.0%us,  0.3%sy,  0.0%ni, 96.5%id,  0.2%wa,  0.0%hi,  0.0%si,  0.0%st

=====> 加了sed 同樣的過(guò)濾，結(jié)果就不一樣樣了，后者是期望的結(jié)果。

# top -n 1 |grep Cpu |sed -e 's#%..##g'
Cpu(s):  3.0mus,  0.3msy,  0.0mni, 96.5mid,  0.2mwa,  0.0mhi,  0.0msi,  0.0mst

# top -n 1 -b |grep Cpu |sed -e 's#%..##g'
Cpu(s):  3.0,  0.3,  0.0, 96.5,  0.2,  0.0,  0.0,  0.0

=====>　基本原因：
       -b : Batch mode operation
            Starts  top  in 'Batch mode', which could be useful for sending output from top to other programs or
            to a file.  In this mode, top will not accept input and runs until the iterations limit  you've  set
            with the '-n' command-line option or until killed.

=====>　更多原因？
# top -n 1 |grep Cpu |sed -e 's#%##g' 或者sed -e 's/%//g'是可以替換掉%的，為什么加了通配..就不行了？多出來(lái)的m又是從哪里來(lái)的？

jason680

=====> 兩者結(jié)果一樣

# top -n 1 |grep Cpu
Cpu(s):  3.0%us,  0.3%sy,  0.0%ni, 96.5%id,  0.2%wa,  0 ...
shahand 發(fā)表于 2010-12-27 17:24

# top -n 1 | grep Cpu
Cpu(s):  0.0% us,  0.0% sy,  0.0% ni, 100.0% id,  0.0% wa,  0.0% hi,  0.0% si

# top -n 1 | grep Cpu | hexdump -C
00000000  43 70 75 28 73 29 3a 1b  5b 6d 1b 28 42 1b 5b 33  |Cpu(s):.[m.(B.[3|
00000010  39 3b 34 39 6d 1b 5b 6d  1b 28 42 20 20 30 2e 30  |9;49m.[m.(B  0.0|
00000020  25 20 1b 5b 6d 1b 28 42  1b 5b 33 39 3b 34 39 6d  |% .[m.(B.[39;49m|
00000030  75 73 2c 1b 5b 6d 1b 28  42 1b 5b 33 39 3b 34 39  |us,.[m.(B.[39;49|
00000040  6d 1b 5b 6d 1b 28 42 20  20 30 2e 30 25 20 1b 5b  |m.[m.(B  0.0% .[|
00000050  6d 1b 28 42 1b 5b 33 39  3b 34 39 6d 73 79 2c 1b  |m.(B.[39;49msy,.|
...

L_kernel

不懂，不懂。應(yīng)該和top有關(guān)系的。求解釋。

ly5066113

回復(fù) 1# shahand


top -n 1 |grep Cpu | cat -A 看下
應(yīng)該有控制字符在里面，為了達(dá)到高亮等一些顯示效果。

shahand

謝謝幾位同志，原因果然是2樓和4樓所分析。