unitproc/bkt-remove_leading_zeroes

   1 #!/bin/bash
   2
   3 read_stdin() {
   4     # Desc: Consumes stdin; outputs as stdout lines
   5     # Input: stdin (consumes)
   6     # Output: stdout  (newline delimited)
   7     #         return  0  stdin read
   8     #         return  1  stdin not present
   9     # Example: printf "foo\nbar\n" | read_stdin
  10     # Depends: GNU bash (version 5.1.16), GNU Coreutils 8.32 (cat)
  11     # Version: 0.1.1
  12     # Attrib: Steven Baltakatei Sandoval (2024-01-29). reboil.com
  13     local input_stdin output;
  14
  15     # Store stdin
  16     if [[ -p /dev/stdin ]]; then
  17         input_stdin="$(cat -)" || {
  18             echo "FATAL:Error reading stdin." 1>&2; return 1; };
  19     else
  20         return 1;
  21     fi;
  22
  23     # Store as output array elements
  24     ## Read in stdin
  25     if [[ -n $input_stdin ]]; then
  26         while read -r line; do
  27             output+=("$line");
  28         done < <(printf "%s\n" "$input_stdin") || {
  29             echo "FATAL:Error parsing stdin."; return 1; };
  30     fi;
  31
  32     # Print to stdout
  33     printf "%s\n" "${output[@]}";
  34
  35     return 0;
  36 }; # read stdin to stdout lines
  37 remove_leading_zeroes() {
  38     # Desc: Removes leading zeroes from lines
  39     # Input: stdin
  40     # Output: stdout
  41     # Depends: BK-2020-03 read_stdin()
  42     # Version: 0.0.1
  43     while read -r line; do
  44         printf "%s\n" "$line" | sed -E -e 's/(^0*)([0-9].*)/\2/';
  45     done < <(read_stdin);
  46 };
  47
  48 printf "00000.jpg\n0001.jpg\n2.jpg\n000003.jpg\n0010.jpg\n";
  49 printf "========================\n";
  50 printf "00000.jpg\n0001.jpg\n2.jpg\n000003.jpg\n0010.jpg\n" | remove_leading_zeroes;
  51