Shell Programming and Scripting

Hello.
After looking through the forum I am trying without success to remove lines from a file each time that ligne contains a pattern.
As this is running in script, I am using some variables:

The command : sed '/pattern/d' source_file > corrected_source_file

In the script

Code:

sed  '/${$BACKUPDIR}/d' "$TMPBACK/err_diff.txt" > "$TMPBACK/err_diff.txt.new"

where the pattern is $BACKUPDIR and contains :

Code:

 /data_1/002_config_linux/install_2012_09_04/006_backup_current_conf_files/2012_09_04

where the source file to search in : $TMPBACK/err_diff.txt
which contains 3 lines with only one matching :
ligne 1
Only in /data_1/002_config_linux/install_2012_09_04/006_backup_current_conf_files/2012_09_04/boot/boot/grub: test.lst.1
line 2
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
line 3
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

The expected result in "$TMPBACK/err_diff.txt.new" should be :

line 1
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
line 2
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

Have try without success :

Code:

sed  '@$BACKUPDIR/@d' "$TMPBACK/err_diff.txt" > "$TMPBACK/err_diff.txt.new"

sed @$BACKUPDIR/@d "$TMPBACK/err_diff.txt" > "$TMPBACK/err_diff.txt.new"


But success with tis simple

Code:

sed  '/data_1/d' "$TMPBACK/err_diff.txt" > "$TMPBACK/err_diff.txt.new"

where data_1 is a very small part of the path

Big help is welcome

Code:

sed '/'"${BACKUPDIR//\//\\/}"'/d' "$TMPBACK/err_diff.txt" > "$TMPBACK/err_diff.txt.new"

I am assuming that BACKUPDIR does not contain regexp metacharacters.

Thank you very much