Linux Shell Scripting Cookbook - Third Edition

Combining multiple expressions

Multiple sed commands can be combined with pipes, patterns separated by semicolons, or the -e PATTERN option:

    sed 'expression' | sed 'expression'

The preceding command is equivalent to the following commands:

    $ sed 'expression; expression'

Or:

    $ sed -e 'expression' -e expression'

Consider these examples:

    $ echo abc | sed 's/a/A/' | sed 's/c/C/'
    AbC
    $ echo abc | sed 's/a/A/;s/c/C/'
    AbC
    $ echo abc | sed -e 's/a/A/' -e 's/c/C/'
    AbC