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Old 04-27-2011, 01:04 PM   #1
boumphreyfr
LQ Newbie
 
Registered: Apr 2011
Distribution: lubuntu
Posts: 14

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problem with ' set $(cat crpage)'


I have several lines of text that I want to sort by line and display
Code:
#!/bin/bash 
crpage="
                               NEW YORK
                         HENRY HOLT AND COMPANY
                                  1916
                       [several more lines...] 
                     J. R., L. E. W., and L. T. S.,
                  without whose help this small record
                      could not have been written."

	IFS=$'\n'
	set $(cat crpage) 
        echo $1
        echo $2
        echo $15
exit

The proble is $1 and $2 show the first and second ine but $15 shows:
NEW YORK5
In other words line 1 !!

Ie tried quotes with no success. Any ideas?

Last edited by boumphreyfr; 04-27-2011 at 04:26 PM. Reason: put in code tags
 
Old 04-27-2011, 01:26 PM   #2
David the H.
Bash Guru
 
Registered: Jun 2004
Location: Osaka, Japan
Distribution: Debian sid + kde 3.5 & 4.4
Posts: 6,823

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Positional parameters larger than 9 need to use the full variable form: "${15}".

And from now on, please use [code][/code] tags around your code, to preserve formatting and to improve readability.
 
1 members found this post helpful.
Old 04-27-2011, 03:01 PM   #3
boumphreyfr
LQ Newbie
 
Registered: Apr 2011
Distribution: lubuntu
Posts: 14

Original Poster
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Thankyou
My first post didn't know about [code][code] ,should have RTFM
Frank
P.S.
I have now added code tags

Last edited by boumphreyfr; 04-27-2011 at 04:27 PM. Reason: announce:added code tags
 
Old 04-28-2011, 07:37 AM   #4
David the H.
Bash Guru
 
Registered: Jun 2004
Location: Osaka, Japan
Distribution: Debian sid + kde 3.5 & 4.4
Posts: 6,823

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Not to worry. It's common with newcomers.

Although I would've put the ending tag after the last line of code instead of the end of the post.

A couple more things to comment on:

You can usually use redirections instead of cat when accessing file contents. In this case you can use:
Code:
set $( <crpage )
Personally, I don't like using set/shift with the positional parameters. I prefer to use arrays instead. Bash v.4 even has a new mapfile built-in that makes it easy to load lines from a file into an array.
Code:
mapfile -t arr <crpage     #-t removes the trailing newline
     
#or for earlier versions of bash:
#IFS=$'\n'
#arr=( $(<crpage) )

echo "${arr[0]}"           #you should generally quote variable expansions
echo "${arr[1]}"           #especially when they can contain spaces
echo "${arr[14]}"          #and other shell-reserved characters
There's no need to fool with IFS this way either (at least, not with v.4). The only thing you have to remember is that arrays are 0-indexed, so you need to subtract one from each line number to reference it.

(Or mapfile also has an -O option, which lets you set the index start number to whatever you want.)
 
  


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