Bash: How to avoid warning: here-document at line XX delimited by end-of-file (wanted `EOM') [duplicate]

Answer 1

When using a here-document, make sure the delimiter is the only string on the line. In your case, the right parenthesis is taken as part of the word, so the matching delimiter is not found. You can safely move it to the next line:

USAGE=$(cat <<EOM
Usage:${BASENAME} [-h] [-n] [-q]
-h, --help        This usage message
-n, --dry-run     
-q, --quiet       
-d, --Destination 
EOM
)

Answer 2

While this does not really answer you question, have you considered using read instead of cat?

read -d '' usage <<- EOF
Usage:${BASENAME} [-h] [-n] [-q]
-h, --help        This usage message
-n, --dry-run     
-q, --quiet       
-d, --Destination 
EOF

echo "$usage"

It reads the content of the here string into the variable usage, which you can then output using echo or printf.

The advantage is that read is a bash builtin and thus faster than cat (which is an external command).

You can also simply embed newlines in a string:

usage="Usage:${BASENAME} [-h] [-n] [-q]
-h, --help     This usage message
...
"