How to remove a special character in a string in a file using linux commands

Question

I need to remove the character : from a file. Ex: I have numbers in the following format:

b3:07:4d

I want them to be like:

b3074d

I am using the following command:

grep ':' source.txt | sed -e 's/://' > des.txt

I am new to Linux. The file is quite big & I want to make sure I'm using the write command.

Answer 1

您可以不用grep：

sed -e 's/://g'  source.txt > des.txt

Answer 2

-i选项可在适当位置编辑文件。

sed -i 's/://' source.txt

Answer 3

the first part isn't right as it'll completely omit lines which don't contain :

below is untested but should be right. The g at end of the regex is for global, means it should get them all.

sed -e 's/://g' source.txt > out.txt

updated to better syntax from Jon Lin's answer but you still want the /g I would think