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Do you have GNU version of sed? sed -i 's/\(TABLE._DATE=\).*/\1your_parameter/' file

Try: perl -i -pe 's/(?<=TABLE._DATE=).*/your_parameter/' file
Make a backup of your file first ;)

Like this?

oldDate=30-jan-2011
newDate=31-dec-2011
sed 's/'$oldDate'/'$newDate'/' myFile


Since there are no metacharacters in your strings, you could do even simpler:

sed...

sed 's/\(.*_vw_\)\(.*\)/\2/' urfile

try:
sed 's/\(.*\)\(_vw_.*\)/\1/' urfile

$ echo $samplet
dwh123 2563 4562 4236 1236 78956 12394 4552 dwh192 2656 46536 231326 65652 6565 23262 16625623 dwh956 2365 12232 46656 56522 464646 66262 65522

$ echo $samplet | sed...