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How to delete a particular text without opening the file.

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# 8  
Old 08-29-2005
And here are the tutorials. One is from this forum itself

Check out the tutorial page.

The other is the Orielly Book sed and awk

vino
# 9  
Old 02-21-2008
hi.. need help removing some values
I need to remove the lines for which the values after the second ":" are null or consists of only spaces.
Ex:

a:a:
b:B:BB
c:C:CC
d:d:


Here the first and the fourth line can contain space.
How to get the following output?
b:B:BB
c:C:CC
# 10  
Old 02-21-2008
Code:
sed -n -e "s/^[^:]*:[^:]*:[^ ]*/&/p" in.txt

# 11  
Old 02-21-2008
Thanks vino, but this is giving all the lines as the output.
To clarify the part AFTER the second colon can contain spaces.

I am new to Unix so can't actually decode the RegEx for the sed. Smilie
Can you please modify it as needed. Thanks
# 12  
Old 02-21-2008
one way i found to do it is using AWK:
awk -F: '{if($3!="" && $3!=" " && $3!=" " && $3!=" " && $3!=" " && $3!=" " && $3!=" "){print}}' log.log
but this does not seem like a feasible solution since the number of spaces is fixed.
# 13  
Old 02-21-2008
Quote:
Originally Posted by stevefox
Thanks Vino,

I have another question.

Could someone tell me how to delete a string from a line in a specific position using sed or other editors which doesn't require files to be opened?

e.g. I have a file called myfile.txt which contains three lines of text below and I want all of the lines to have 5 characters or less.

1234567
a b c d e
098


I want the result to be like below:

12345
a b c
098

Any help will be appreciated.

BTW please let me know if you have any recommended sites for learning unix commands such as above.

Cheers
Steve
Use cut command to get the 5 characters
Quote:
cut -c 1-5 file1 > file2
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