04-19 18:26:55.605 22750 22883 W System.err: java.lang.NoSuchFieldException
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.au.a(Unknown Source:16)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.au.a(Unknown Source:4)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.z.a(Unknown Source:880)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.z.a(Unknown Source:188)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.p.a(Unknown Source:821)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.p.a(Unknown Source:605)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.p.a(Unknown Source:11)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.d.a(Unknown Source:46)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.ak.b(Unknown Source:50)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.ak.a(Unknown Source:10)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.XMPushService$c.a(Unknown Source:8)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.XMPushService$i.run(Unknown Source:37)
04-19 18:26:55.605 22750 22883 W System.err:  at com.xiaomi.push.service.g$c.run(Unknown Source:175)
04-19 18:27:24.787 23660 23685 W System.err: load vdr indoor lib success.

adb logcat | grep "System.err" --line-buffered | cut -d " " -f 6-
System.err: java.lang.NoSuchFieldException
System.err:   at com.xiaomi.push.au.a(Unknown Source:16)
System.err:   at com.xiaomi.push.au.a(Unknown Source:4)
System.err:   at com.xiaomi.push.service.z.a(Unknown Source:880)
System.err:   at com.xiaomi.push.service.z.a(Unknown Source:188)
System.err:   at com.xiaomi.push.service.p.a(Unknown Source:821)
System.err:   at com.xiaomi.push.service.p.a(Unknown Source:605)
System.err:   at com.xiaomi.push.service.p.a(Unknown Source:11)
System.err:   at com.xiaomi.push.service.d.a(Unknown Source:46)
System.err:   at com.xiaomi.push.service.ak.b(Unknown Source:50)
System.err:   at com.xiaomi.push.service.ak.a(Unknown Source:10)
System.err:   at com.xiaomi.push.service.XMPushService$c.a(Unknown Source:8)
System.err:   at com.xiaomi.push.service.XMPushService$i.run(Unknown Source:37)
System.err:   at com.xiaomi.push.service.g$c.run(Unknown Source:175)

# 取第一个字节
pi@raspberrypi:~ $ echo "abcdef" | cut -b 1
a


# 取第二个字节
pi@raspberrypi:~ $ echo "abcdef" | cut -b 2
b


# 从1开始，0会报错
pi@raspberrypi:~ $ echo "abcdef" | cut -b 0
cut: byte/character positions are numbered from 1
Try 'cut --help' for more information.

#1到2字节位置切分
pi@raspberrypi:~ $ echo "abcdef" | cut -b 1-2
ab

# 限定区间起始位置，不限定结束位置
pi@raspberrypi:~ $ echo "abcdef" | cut -b 1-
abcdef

# 限定区间结束位置，但不限定起始位置
pi@raspberrypi:~ $ echo "abcdef" | cut -b -5
abcde

pi@raspberrypi:~ $ echo "abcdef" | cut -b 1,3,5
ace

# 异常出现
echo "小黑屋" | cut -b 1
�

##必须限定满足正确的开始和结束位置
echo "小黑屋" | cut -b 1-3
小

echo "abcd技术小黑屋ef" | cut -c 7
小

echo "abcd技术小黑屋ef" | cut -c 7-9
小黑屋

echo "abcd技术小黑屋ef" | cut -c 7,8,9
小黑屋

echo "abcd技术小黑屋ef" | cut -c 5-
技术小黑屋ef

echo "abcd技术小黑屋ef" | cut -c -9
abcd技术小黑屋

echo "A|BC|DEF|GHIJ" |  cut -d "|" -f 1
A

echo "A|BC|DEF|GHIJ" |  cut -d "|" -f 2
BC

echo "A|BC|DEF|GHIJ" |  cut -d "|" -f 3
DEF

# 区间，限定开始位置
echo "A|BC|DEF|GHIJ" |  cut -d "|" -f 1-
A|BC|DEF|GHIJ

#区间，限定结束位置
echo "A|BC|DEF|GHIJ" |  cut -d "|" -f -3
A|BC|DEF

# 区间，限定开始和结束位置
echo "A|BC|DEF|GHIJ" |  cut -d "|" -f 1-2
A|BC

#提供多个位置
echo "A|BC|DEF|GHIJ" |  cut -d "|" -f 1,2
A|BC