remove : lines from file

Shell Programming and Scripting
1

A small question

I have a test.txt file
I have contents as:

a:google
b:yahoo
:
c:facebook
:
d:hotmail

How do I remove the line with :

my output should be

a:google
b:yahoo
c:facebook
d:hotmail

2

grep -v "^:" inp

-----Post Update-----

grep -v "^:" test.txt

-----Post Update-----

grep -v "^:" test.txt

3

Try this

sed -e '/^:/d' b.sql > c.sql

Where, Contents of i/p File : b.sql

4

would be stricter.
Regards.

5 
awk 'length > 1' "$file"

Or:

awk '/^:$/{next}1' "$file"

Or:

awk 'length - 1' "$file"

Or:

sed -n '/../p'

etc., etc., ...

Of course, the right answer depends on a more specific statement of the problem.

The criterion given was, "How do I remove the line with :". All the lines have a colon, so presumably the requirement is, "How do I remove the lines with nothing but a :".

6

To remove the lines containing only a colon.

grep -v '^:$' test.txt