Complex Sed Example.sed

Complex Sed Example.sed

/* n flag - Turn off printing by default */
1{h;                            /* On the first line, save the line to temporary storage ('hold' buffer)           */
d};                             /* Then delete the current line and go to the next                                 */
2{H;                            /* On the second line, append the current line to the 'hold' buffer                */
x;                              /* Swap the line and the 'hold' buffer                                             */
s:\n::;                         /* Remove newlines from the line                                                   */
x;                              /* Swap it with the 'hold' buffer                                                  */
d};                             /* Delete the current line                                                         */
3{s:\(.*\): (\1):;              /* Add a space to the end of the line                                              */
H};                             /* Append this line to the 'hold' buffer                                           */
\%/usr/local% {s:\(.*\): [\1]:; /* On lines matching '\/usr\/local\/, Wrap in square brackets, and prepend a space */
H;                              /* Append this line to the 'hold' buffer                                           */
x;                              /* Swap it back into the 'line' buffer                                             */
s:\n::g;                        /* Remove all new lines                                                            */
p};                             /* Print it                                                                        */