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Thanks it working.
Ya I am using tcsh.
Yes in bash shell, sed "s/'$'/$/g" work smoothly. I have check just know.
But still I did not understand why it was working for '>' in tcsh but did not work for '$'. And why you have use so many seperater.
It doesn't work because tcsh sees the '$' character and tries to substitute it with a variable. That's why the dollar sign has to be within single quotes. The single quotes, on the other hand, have to be within double quotes. Escaping neither $ nor ' seems to work in csh. But I don't use csh, so I don't know... maybe there's a better solution. I allways thought quoting and escaping would work the same way in all unix shells. Seems I was wrong