[SOLVED] Help counting elements from an array in Bash Script.

pampers · 04-13-2013, 08:03 AM

Hello.

I am very newbie in bash coding, I have a file with the elements:

apple
pear
juice
orange

I need to read this file in bash script, and print those values and the number of elements line by line attached to those values, for example what I need to print as output is:

1 apple
2 pear
3 juice
4 orange

I know I can read the elements from a file with the command "wc -l" but i don,t want the total of elements printed on screen, I want line per line printed. In Perl I know I can do this with foreach:

Code:

foreach my $value (0..$#fruits) {
        print $value + 1 . " $fruits[$value]\n";
    }

will probably print on screen:

1 apple
2 pear
3 juice
4 orange

But since I don,t have foreach in bash, is kind of hard for me to translate from perl to bash. What I have done in bash for reading the file is:

Code:

file=($(cat myfruits.txt))

for a in ${file[*]}
do

 echo $a

done

Any help will be very appreciated.

pampers · 04-13-2013, 08:34 AM

Is ok.

I did this task with Perl instead of Bash, and now is working.

So this thread can be closed.

Thanks for any consideration to help me

konsolebox · 04-13-2013, 09:09 AM

Please be patient for answers. You could try this.

Code:

ARRAY=(apple pear juice orange)
for I in "${!ARRAY[@]}"; do
    echo "$(( I + 1 )) ${ARRAY[I]}"
done

---- Edit ----

Sorry I actually took a look at your code first and based the solution from it without reading much..

It could be done this way:

Code:

LN=0
FILE=/path/to/file.ext
while read LINE; do
    echo "$(( ++LN )) ${LINE}"
done < "$FILE"

And this is yet another way if your version of bash is 4.0 or newer.

Code:

FILE=/path/to/file.ext
readarray -t -O 1 LINES < "$FILE"
for I in "${!LINES[@]}"; do
    echo "$I ${LINES[I]}"
done

danielbmartin · 04-15-2013, 08:08 AM

With this InFile ...

Code:

apple
pear
juice
orange

... this code ...

Code:

nl -s" " -w1 $InFile >$OutFile

... produced this OutFile ...

Code:

1 apple
2 pear
3 juice
4 orange

Daniel B. Martin