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  #1 (permalink)  
Old 09-18-2006
Registered User
  

Join Date: Mar 2005
Posts: 15
sed not working
Hi,

Iam doing the following using sed in a script , it is NOT working

line_old= 3754|Yes|Yes
line_new= 3754|Yes|Yes|Yes|Yes

sed -e 's/$line_old/$line_new/' data.$$ > tmp.$$
mv tmp.$$ data.$$

Regards
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Old 09-18-2006
vino's Avatar
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Join Date: Feb 2005
Location: Bangalore, India
Posts: 2,639
Quote:
Originally Posted by baanprog
Hi,

Iam doing the following using sed in a script , it is NOT working

line_old= 3754|Yes|Yes
line_new= 3754|Yes|Yes|Yes|Yes

sed -e 's/$line_old/$line_new/' data.$$ > tmp.$$
mv tmp.$$ data.$$

Regards
Drop the single quotes and introduce double quotes.
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Old 09-18-2006
tayyabq8's Avatar
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Join Date: Nov 2004
Location: /World/Asia/MiddleEast/Kuwait/Salmiya
Posts: 513
Vino,

It was an interesting thing to know about, can you pls explain the logic behind.

Regards,
Tayyab
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Old 09-18-2006
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Join Date: Mar 2005
Posts: 15
That was awesome
It worked thanks
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Old 09-18-2006
vino's Avatar
Supporter (in vino veritas)
  

Join Date: Feb 2005
Location: Bangalore, India
Posts: 2,639
Quote:
Originally Posted by shereenmotor
Vino,

It was an interesting thing to know about, can you pls explain the logic behind.

Regards,
Tayyab
See the section QUOTING under man sh. Its too big to quote here. But this is what you are looking for..
Code:
       Enclosing  characters  in  double quotes preserves the literal value of
       all characters within the quotes, with the exception of $,  `,  and  \.
       The  characters  $  and  `  retain  their special meaning within double
       quotes.  The backslash retains its special meaning only  when  followed
       by one of the following characters: $, `, ", \, or <newline>.  A double
       quote may be quoted within double quotes by preceding it with  a  back-
       slash.
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  #6 (permalink)  
Old 09-18-2006
tayyabq8's Avatar
UNIX Hobbyist
  

Join Date: Nov 2004
Location: /World/Asia/MiddleEast/Kuwait/Salmiya
Posts: 513
Vino, thanks for your reply. I know a double quote is used to preserve the literal value of characters, thing of interest was difference between single and double quote.
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