bash: read multiple lines in a file

300zxkyle · 07-27-2007, 01:58 PM

I use this command to create a list of files.

Code:

ls *.ini > filenames

the contents look like:

Code:

$> cat filenames
file1.ini
file2.ini
file3.ini
file4.ini

I need to be able to read that list into an array in a bash script. How would I start about doing this. I've tried :

Code:

cat filenames | read fileList

But because it only reads a single line of input I only get the first filename. I'm new to shell scripting so I would appreciate any help.

biophysics · 07-27-2007, 03:20 PM

for i in `cat filenames`
do
#do whatever you want to do
#wc $i
#
done

http://tldp.org/LDP/Bash-Beginners-G...ect_09_01.html

Tinkster · 07-27-2007, 04:25 PM

Quote:

Originally Posted by 300zxkyle

I use this command to create a list of files.

Code:

ls *.ini > filenames

the contents look like:

Code:

$> cat filenames
file1.ini
file2.ini
file3.ini
file4.ini

I need to be able to read that list into an array in a bash script. How would I start about doing this. I've tried :

Code:

cat filenames | read fileList

But because it only reads a single line of input I only get the first filename. I'm new to shell scripting so I would appreciate any help.

Code:

#!/bin/bash
declare -a file_array
let count=0

while read LINE <filenames; do

    file_array[$count]=$LINE
    ((count++))
done

Cheers,
Tink

unSpawn · 07-27-2007, 06:08 PM

Quote:

Originally Posted by Tinkster

Code:

while read LINE <filenames; do

    file_array[$count]=$LINE
    ((count++))
done

...doesn't work for me, this does:

Code:

declare -a array; count=0; for LINE in $(<filenames)
do array[$count]="$LINE"; ((count++)); done

--

Code:

function help() { echo "Bash scripting guides:
http://www.tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html 
http://www.tldp.org/LDP/Bash-Beginners-Guide/html/index.html 
http://www.tldp.org/LDP/abs/html/"; }

jschiwal · 07-27-2007, 06:14 PM

Do you really need the list?

Code:

initfiles=($(cat list))

These examples assume that the filenames don't contain whitespace characters.

Tinkster · 07-28-2007, 12:37 AM

Quote:

Originally Posted by unSpawn

...doesn't work for me, this does:

Code:

declare -a array; count=0; for LINE in $(<filenames)
do array[$count]="$LINE"; ((count++)); done

That's what "making shortcuts w/o testing" gives me :}
I thought I could scipt the file-descriptor ... wrong
was I ...

In my old script there's a few more things going
on ...

Code:

declare -a file_array
let count=0
exec 5<filenames
while read LINE <&5; do
    echo $LINE
    file_array[$count]=$LINE
    ((count++))
done
exec 5>&-

Thanks spawny...

Cheers,
Tink

jschiwal · 07-28-2007, 08:15 AM

What does spawny mean?

Quote:

When someone flukes a pot in a game of pool the phrase 'you spawny git' would be ...

What does "flukes a pot" mean?

unSpawn · 07-29-2007, 04:38 AM

Quote:

What does spawny mean?

In this context it's got nothing to do with slang but it's a bastardisation of my handle. "To fluke a pot" should translate to something like a lucky shot.