unix - Shell: How to append characters at the end of a string? -

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i need write shell script append characters each line in text make lines same length. example, if input is:

line 1 has 25 characters. line 2 has 27 characters. line 3: lines must have same number of characters.

here "line 3" has 58 characters (not including newline character) have append 33 characters "line 1" , 31 characters "line 2". output should like:

line 1 has 25 characters.000000000000000000000000000000000 line 2 has 27 characters.0000000000000000000000000000000 line 3: lines must have same number of characters.

we can assume max length (58 in above example) known.

here 1 way of doing it: 

while read -r;                                 # read file 1 line @ time     printf "%s" "$reply"                          # print line without newline     (( i=1; i<=((58 - ${#reply})); i++ )); # find difference in length iterate         printf "%s" "0"                           # pad 0s     done     printf "\n"                                   # add newline done < file

output:

line 1 has 25 characters.000000000000000000000000000000000 line 2 has 27 characters.0000000000000000000000000000000 line 3: lines must have same number of characters.

of course easy if know max length of line. if don't need read file in array keep track of length of each line , keeping length of line longest in variable. once have read file, iterate array , same for loop shown above.


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