关于grep查找的一个问题

tigersky2000

+how do you input ^M

CTRL + V + M   or  char ^  + char M

cat tmp|grep '^M' (^M is char ^  + char M )

cat -v tmp|grep '^M'  (^M is char ^  + char M )

result : no line is greped

but
cat tmp|grep '^M' (^M is CTRL +V+M)
I can get the right answer

grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

forest077

grep "$(echo "\0055"" file

这是我前面的代码，把\0055后面的三个数字改成其他的8进制数就可以查找那个相应的符号了。比如^M，除了ctrl+v+M以外，可以用grep "$(echo "\0015"" file来查找。用这个方法的好处是，你可以把echo后面的那个8进制数放在变量里面，进行其他的运算。如果只是要查找某个特定的字符，直接敲那个字符或者敲ctrl+v+？（？代表相应的控制字符）就可以了。看你的需要了。

forest077

输入控制字符的方法是(比如说^M)ctrl+v+M，而不是char ^+char M

tigersky2000

forest077, it didn't work.

1. 
   
2. $echo "\0015"
   
3. \0015
   
4. 
   
5. $grep -c "$(echo "\0015")" tmp
   
6. 0
   

复制代码

[david@RH9 shl]$ grep -V
grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

forest077

我的可以，我是sco5.05+ksh