Sed
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errror messages
sed: -e expression #1, char 32: unknown command: `\'
try
's/...
instead of
'/...
match whitespace
\s
replace newline
try tr instead:
tr -d '\n' < file
Edit in-place
sed -i
match number
sed 's/.*\([0-9]\+\).*/\1/'
or
sed -r 's/.*([0-9]+).*/\1/'