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Yes you would need to leave out the curly brackets too, that belong to the shell variables. Try:
sed "/RED/s/^\(.\{101\}\).\{7\}/\1BLUE/"

To make it easier and safer, maybe you sould consider formating your file with a separator at first (here an example with colon ":" as separator)

sed 's/PO BOX [0-9][0-9]*/:&:/;s/[^ ][^...

You can pad numbers with a format specifier like %03d, but iirc it doesn't work with strings - check the man page(s).

just a try .. ;)

$ echo $a
"JERRY SMITH"
$ echo $b
filename
$ x=$(sed -n "/$a/p" $b)
$ echo $x
"JERRY SMITH"
$

You need to quote $a so that it is passed as a single token to grep:


x=`grep -c "$a" "$b"`


Putting the quotes as a part of the string that is assigned to the variable does not have the...

That's not a very good solution. Try some of the others given to you.

Perhaps something like this?

if [ -f /path/to/file ]; then echo 1; else echo 0; fi

test -e /etc && echo exists
exists

test -f /etc && echo file

echo $?
1

You asked to add/insert a string, this way the original data is incremented by the string and thus shifted.

If you do not want to have the data shifted, then you want to replace:
sed...