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| Chapter 10 The Sed Editor |

## s

    [address1][,address2]s/pattern/replacement/[flags]

Substitute `replacement` for `pattern` on each addressed line. If pattern addresses are used, the pattern // represents the last pattern address specified. The following flags can be specified:

n

  Replace `n`th instance of /`pattern`/ on each addressed line. `n` is any number in the range 1 to 512; the default is 1.

g

  Replace all instances of /`pattern`/ on each addressed line, not just the first instance.

p

  Print the line if a successful substitution is done. If several successful substitutions are done, multiple copies of the line will be printed.

w file

  Write the line to a `file` if a replacement was done. A maximum of 10 different `files` can be opened.

### Examples

Here are some short, commented scripts:

>     # Change third and fourth quote to ( and ):
>     /function/{
>     s/"/(/3
>     s/"/)/4
>     }
>     # Remove all quotes on a given line:
>     /Title/s/"//g
>     # Remove first colon or all quotes; print resulting lines:
>     s/://p
>     s/"//gp
>     # Change first "if" but leave "ifdef" alone:
>     /ifdef/!s/if/   if/

Reference: r |  | Reference: t