Question

I have a html file with some variable arrays that I need to increment. I have been doing it by hand – but now is taking up too much of my time. I have been searching and trying to find the correct tool/syntax to do exactly what I want.

say I have:

file[0]=["blah0 blah0", "file0.jpg"]
file[1]=["blah1 blah1", "file1.jpg"]
file[2]=["blah2 blah2", "file2.jpg"]

What I would like to do is have the script add one to the variable number giving me room to add more variables earlier. I could specify 5 and have the result be

file[5]=["blah0 blah0", "file0.jpg"]
file[6]=["blah1 blah1", "file1.jpg"]
file[7]=["blah2 blah2", "file2.jpg"]

This is what I have tried so far – but not much luck… as it removes all the square brackets

awk -F [\]\[]  '/^file\[[0-9]+\]=/ {$2="["$2+'$userinput'"]";}1' ${workdirect}/index.html > text.txt

Any advice???

Answer 1

#!/bin/bash
FILE=$1

awk '/^file/ {
  m = match($0, "\[[0-9]+\]");
  if (m) {
    printf("%s%d%s\n",
           substr($0, 0, RSTART),
           INC + substr($0, RSTART + 1, RLENGTH - 2),
           substr($0, RSTART + 2, length($0) - RSTART))
  }
}' INC=$2 $1

$ foo.sh tmphtml 5
file[5]=["blah0 blah0", "file0.jpg"]
file[6]=["blah1 blah1", "file1.jpg"]
file[7]=["blah2 blah2", "file2.jpg"]