Question

bash: read file into array

Asked by: Dr-Hussain

Hi Experts,

I need some help, I want to read a file and store each line as an item in the array.

Thanks
Hussain

#!/bin/sh
 
exec< $1
echo "data in $1 will be processed now."
input=[]
i = 0
while read line
do
        input[$i] = $line;
        i = $i + 1;
done
 
echo {$input[*]}

                                  
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Asked On
2008-02-23 at 11:10:45ID23187422
Tags

bash

Topics

Shell Scripting

,

Bourne-Again Shell (bash)

Participating Experts
2
Points
200
Comments
13

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Answers

 

by: ozoPosted on 2008-02-23 at 11:59:48ID: 20966382

while read line
do
        input[$i]=$line;
        i=$(( $i + 1 ))
done

echo ${input[*]}

 

by: Dr-HussainPosted on 2008-02-23 at 12:15:13ID: 20966454

thanks ozo ..but I still get error messages:

{cs1:~/unix/hw1} dosort.sh in.txt
input in in.txt will be proccessed now.
./dosort.sh: i: not found
./dosort.sh: syntax error at line 10: `i=$' unexpected
{cs1:~/unix/hw1}

 

by: TintinPosted on 2008-02-23 at 12:32:02ID: 20966532

*Why* do you want to store each line in an array?  It's very rare you need to use shell script arrays in this way.

 

by: ozoPosted on 2008-02-23 at 12:43:09ID: 20966593

are you using bourne SHell or Bourne Again SHell

 

by: Dr-HussainPosted on 2008-02-23 at 13:15:18ID: 20966786

I think I am using bourne shell

I need to implement a sort algorithm and I need to store every line in the array.

Thanks

 

by: Dr-HussainPosted on 2008-02-23 at 13:15:58ID: 20966791

I think there is a way to know what shell I am using but I forget how to do that!

 

by: ozoPosted on 2008-02-23 at 13:19:01ID: 20966805

why not use the
sort
utility?

 

by: Dr-HussainPosted on 2008-02-23 at 13:27:22ID: 20966829

I need to make my own implementation for education purposes.

 

by: TintinPosted on 2008-02-23 at 13:30:06ID: 20966843

Bourne shell doesn't support arrays, so unless you have ksh or bash on your system, you won't be able to do want you require.

What does

ls -l /bin/*sh*

display?

 

by: Dr-HussainPosted on 2008-02-23 at 13:37:48ID: 20966873

this is the output : ( I need to make this  in bash)

-r-xr-xr-x   1 root     bin       732556 May  2  2007 /bin/bash
-r-xr-xr-x   2 root     bin       151456 Aug  8  2006 /bin/csh
-rwxr-xr-x   1 root     other      23880 Jan 22  2005 /bin/glib-genmarshal
-rwxr-xr-x   1 root     other        703 Dec 16  2004 /bin/gnome-autogen.sh
-rwxr-xr-x   1 root     other     329388 Feb  6  2006 /bin/gnome-panel-screenshot
-r-xr-xr-x  17 root     bin          134 Jan 21  2005 /bin/hash
-rwxr-xr-x   1 root     other     283652 Dec 15  2004 /bin/jdshelp
lrwxrwxrwx   1 root     root          13 Aug 14  2007 /bin/jsh -> ../../sbin/sh
-r-xr-xr-x   3 root     bin       209312 Aug  8  2006 /bin/ksh
-r-xr-xr-x   2 root     bin       151456 Aug  8  2006 /bin/pfcsh
-r-xr-xr-x   3 root     bin       209312 Aug  8  2006 /bin/pfksh
lrwxrwxrwx   1 root     root          13 Aug 14  2007 /bin/pfsh -> ../../sbin/sh
lrwxrwxrwx   1 root     root           5 Aug 14  2007 /bin/remsh -> ./rsh
-r-xr-xr-x   3 root     bin       209312 Aug  8  2006 /bin/rksh
-r-sr-xr-x   1 root     bin        27780 Jun 11  2007 /bin/rsh
lrwxrwxrwx   1 root     root          13 Aug 14  2007 /bin/sh -> ../../sbin/sh
-rwxr-xr-x   1 root     sys        29992 May 31  2007 /bin/showrev
-r-xr-xr-x   1 root     bin       257316 Jun  6  2007 /bin/ssh
-r-xr-xr-x   1 root     bin        87744 Jun  6  2007 /bin/ssh-add
-r-xr-xr-x   1 root     bin        70912 Jan 22  2005 /bin/ssh-agent
-r-xr-xr-x   1 root     bin        87792 Jan 22  2005 /bin/ssh-keygen
-r-xr-xr-x   1 root     bin       156092 Jun  6  2007 /bin/ssh-keyscan
-r-xr-xr-x   1 root     bin       363520 May  2  2007 /bin/tcsh
lrwxrwxrwx   1 root     root          14 Aug 14  2007 /bin/zsh -> ../sfw/bin/zsh

 

by: TintinPosted on 2008-02-23 at 13:50:34ID: 20966925

OK, just  change your script where is has

#!/bin/sh

to

#!/bin/bash

 

by: Dr-HussainPosted on 2008-02-23 at 13:59:48ID: 20966957

thanks it works now ..but I get one strange error:

./dosort.sh: line 6: i: command not found

 

by: Dr-HussainPosted on 2008-02-23 at 14:11:28ID: 20966990

ok .. I got it now ..it is the white space !!

Thanks everyone.

20120131-EE-VQP-002

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