Changing a character string

For changing text or correcting spelling errors, use the s (substitute) subcommand. When you enter the subcommand, the line you are changing becomes your current working line. To display the line after you make the change, enter the p (print) subcommand.

To substitute text for the first matching string on the current working line, enter:
```
s/oldtext/newtext/
```
To substitute text for the first matching string on a specified line, enter:
```
ns/oldtext/newtext/
```
where n is the number of the line.
To substitute text for the first matching string on more than one line, enter:
```
a1,a2s/oldtext/newtext/
```
where a1 is the number (or address) of the first line to be changed and a2 is the number of the last line to be changed.
To change every occurrence of a string on more than one line, enter:
```
a1,a2s/oldtext/newtext/g
```
where a1 is the number of the first line to be changed and a2 is the number of the last line to be changed. g is the global operator.
To change every occurrence of a string on one line, enter:
```
ns/oldtext/newtext/g
```
g is the global operator.
To delete a word or string, enter:
```
s/oldtext//
```