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Need Grep command for the following output

Hi
i need grep command for the following output.
I have a file. as given below

Code:

#192.168.48.155

10.0.0.4

      #11.0.0.1



#239.0.01

      #12.1.0.1

        192.168.48.172

192.168.48.100



#192.158.32.0

Questions as follows

To print lines which starts with # character.(# as first character .No space shoule be there #character). Output should be(Idont want blank lines.

Code:

#192.168.48.155 #239.0.01 #192.158.32.0
To print lines which with # character as first character in line and also line with any number of space followed by #character. output should be.

Code:

#192.168.48.155 #11.0.0.1 #239.0.01 #12.1.0.1 #192.158.32.0
To print lines which starts only with space character followed by # as first . Output should be as follows

Code:

#11.0.0.1 #12.1.0.1
To print lines which contains space followed by any characters

Code:

#11.0.0.1 192.168.48.172 #12.1.0.1

Its urgent..
Thanks in advance.

Quote:

Originally Posted by minil

Questions as follows[list][*] To print lines which starts with # character.(# as first character .No space shoule be there #character). Output should be(Idont want blank lines.

Code:

#192.168.48.155

#239.0.01

#192.158.32.0

grep "^#" <infile>

Quote:

[*]To print lines which with # character as first character in line and also line with any number of space followed by #character. output should be.

Code:

#192.168.48.155

      #11.0.0.1

#239.0.01

      #12.1.0.1

#192.158.32.0

grep "^[ ]*#" <infile> (between the square brackets are a space and a tab)

Quote:

[*]To print lines which starts only with space character followed by # as first . Output should be as follows

Code:

    #11.0.0.1

    #12.1.0.1

grep "^[ ][ ]*#" <infile> (again, space and tab between the square brackets)

Quote:

[*]To print lines which contains space followed by any characters

Code:

      #11.0.0.1

      192.168.48.172

      #12.1.0.1

grep "^[ ][ ]*" <infile> (again, space and tab between the square brackets)

Hope this helps.

Thank you very much druuna