sed (variable)

Shell Programming and Scripting
1

HOw can I use any variable in sed command.

For example I am using 'sed -e 's/?/$ORACLE_HOME/g' $file_name

Here it replaces ? with $ORACLE_HOME. Instead of it I need actual value of $ORACLE_HOME. How can I do that?

Please advice.

Thanks in advance.

Malay

2

quote them to substitute

sed -e 's/abc/'$ORACLE_HOME'/g' <filename>

3

==> sed -e 's/?/'$ORACLE_HOME'/g' dest.log
sed: command garbled: s/?//diqr001/opt/tools/oracle/product/9.2.0/g

Not working.

Malay

4

ORACLE_HOME u had provided contains "/"
when substituting with sed
they have to be disabled with a "\"

following is just an example

echo "abc" | sed -e 's/abc/\/diqr001\/opt\/tools\/oracle\/product\/9.2.0/'

change ur script accordingly

5

Wouldn't double-quoting solve the sed expression work ?

sed -e "s/abc/$ORACLE_HOME/g" <filename>
6

But how can I replace '/' in $ORACLE_HOME with '\/'?

Malay

7

Is

sed -e "s/?/$ORACLE_HOME/g" $file_name

working ?

8

Any character (other than backslash or newline) can be used instead of a slash to delimit the regular expression and the replacement.

sed -e "s:?:$ORACLE_HOME:g" $file_name
9

Thanks very much. Its resolved.

10

But that rule doesn't work when I try to delete a line. Like following code doesn't work:

sed ":$ORACLE_HOME: d" $file_name

Simply following works alright

sed '/text/ d' $filename

but not this

sed ':text: d' $filename

So how do I delete a line using variables that contain slashes?

11

You can use any delimiter in the search string too, but you have to backslash it (don't ask me why).

sed '\:text:d' $filename
12

Thank you era for fast reply. And that works!
Thanks again.

13

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14

:confused::confused:

hi i have a big file i need every time to cut number of lines related together and ta delete also first two lines in the file.

for example :
while ( $x <= $n)
set var1 = ` cat file | sed '1,2d' | awk '{print $4}' | sed '$x,$d' `
@ x = $x + $t
end

it gives me an error with sed command which contains the variable ??????

can anyone help me!!!!!!!!!!!!!!!!!!!!