can U pls. ans. this Unix question?

Question

How to replace a word with other in a file.. whats the command in Unix.

Answer 1

To replace the first occurance on each line:
$ sed 's/word1/word2/' infile >outfile

To replace every occurance in the file:
$ sed 's/word1/word2/g' infile >outfile

Answer 2

The command is sed. I don't use it enough to give you the exact syntax for the command but the man page is excellent. This is assuming that the file in question is a text file. If it is a binary file then you will need a hex editor and alot of patience.

Answer 3

just enter in insert mode and del that character and enter new character