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assigning variables in sed command

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# 1  
Old 02-03-2006
assigning variables in sed command
I need to assign a variable within a variable in a sed command.
I tried doing the following in c shell.


set left = 1
set right = 2
set segment = qwerty

sed -n -e "/$segment{$left}/,/$segment{$right}/p" file.txt


what is wrong with this syntax?
# 2  
Old 02-04-2006
Is the -e really needed? -e is for executing a script.
# 3  
Old 02-04-2006
Quote:
Originally Posted by wxornot
I need to assign a variable within a variable in a sed command.
I tried doing the following in c shell.


set left = 1
set right = 2
set segment = qwerty

sed -n -e "/$segment{$left}/,/$segment{$right}/p" file.txt


what is wrong with this syntax?
sed goes by
sed 's/<searchtext>/<replacementtext>/' file

using variables within sed

a=abcdef
b=def
echo abcdefghij | sed "s/$b/$a/"
abcabcdefghij

hope this helps.
# 4  
Old 02-04-2006
Quote:
Originally Posted by wxornot
sed -n -e "/$segment{$left}/,/$segment{$right}/p" file.txt
did you mean :
Code:
sed -ne "/$segment${left}/,/$segment${right}/p" file.txt

?
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