DaemonForums - View Single Post - Taking your sed(1) skills beyond the easily swallowed 's/x/y/' porridge

J65nko · #5 **(View Single Post)** 2nd February 2010

An example using the '$' address, mentioned in the quote by Carpetsmoker from the FreeBSD sed(1) man page:

Code:

$ cat animal.sed

1 {
   i\
A list of animals in our zoo\
----------------------------
}


$ {
   a\
==== END of LIST ====
}

A sample file

Code:

$ cat animal.txt
giraffe
lion
elephant

The result:

Code:

$ sed -f animal.sed animal.txt

 A list of animals in our zoo
----------------------------
giraffe
lion
elephant
==== END of LIST ====

Now we will use a second file

Code:

$ cat animal2.txt
ostrich
hyena
gorilla

Telling sed(1) to process both files

Code:

$ sed -f animal.sed animal*.txt
A list of animals in our zoo
----------------------------
giraffe
lion
elephant
ostrich
hyena
gorilla
==== END of LIST ====

So this a simulation of the behaviour of the GNU/FreeBSD -I option by OpenBSD's sed.

The -i flag equivalent would be

Code:

$ sed -f animal.sed animal.txt ; sed -f animal.sed animal2.txt

A list of animals in our zoo
----------------------------
giraffe
lion
elephant
==== END of LIST ====

A list of animals in our zoo
----------------------------
ostrich
hyena
gorilla
==== END of LIST ====

Note: for readability some whitespace added.