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Returning exit status

exit 1

Code Meaning
0 Success
1 Error

Check for Arguments given

if [ $# -eq 0 ]; then
    echo "Please supply one argument"
    $(exit 1); echo "$?"
elif [ $# -ge 2 ]; then
    echo "Please give only one argument"
    $(exit 1); echo "$?"
fi

Multiline output

cat << EOF
Line 1
Line 2
Line 3
EOF

Will output:

Line 1
Line 2
Line 3