Try ES6 String Template, you can do something like var hereDoc = ` This is a Multiple Line String `.trim() hereDoc == ‘This\nis\na\nMultiple\nLine\nString’ => true You can use this great feature even in older browsers with TypeScript
Yes, the POSIX standard allows this. According to the 2008 version: The here-document shall be treated as a single word that begins after the next <newline> and continues until there is a line containing only the delimiter and a <newline>, with no <blank> characters in between. Then the next here-document starts, if there is one. … Read more
You only need a minimal change; single-quote the here-document delimiter after <<. cat <<‘EOF’ >> brightup.sh or equivalently backslash-escape it: cat <<\EOF >>brightup.sh Without quoting, the here document will undergo variable substitution, backticks will be evaluated, etc, like you discovered. If you need to expand some, but not all, values, you need to individually escape … Read more
The heredoc syntax is much cleaner to me and it is really useful for multi-line strings and avoiding quoting issues. Back in the day I used to use them to construct SQL queries: $sql = <<<SQL select * from $tablename where id in [$order_ids_list] and product_name = “widgets” SQL; To me this has a lower … Read more
You could do echo -e “import sys\nfor r in range(10): print ‘rob'” | python Or without pipes: python -c “exec(\”import sys\nfor r in range(10): print ‘rob’\”)” Or (echo “import sys” ; echo “for r in range(10): print ‘rob'”) | python Or SilentGhost’s answer or Crast’s answer.
In answer to your first question, there’s no parameter substitution because you’ve put the delimiter in quotes – the bash manual says: The format of here-documents is: <<[-]word here-document delimiter No parameter expansion, command substitution, arithmetic expansion, or pathname expansion is performed on word. If any characters in word are quoted, the delimiter is the … Read more
You can avoid a useless use of cat and handle mismatched quotes better with this: $ read -r -d ” VAR <<‘EOF’ abc’asdf” $(dont-execute-this) foo”bar”” EOF If you don’t quote the variable when you echo it, newlines are lost. Quoting it preserves them: $ echo “$VAR” abc’asdf” $(dont-execute-this) foo”bar”” If you want to use indentation … Read more
The cat <<EOF syntax is very useful when working with multi-line text in Bash, eg. when assigning multi-line string to a shell variable, file or a pipe. Examples of cat <<EOF syntax usage in Bash: 1. Assign multi-line string to a shell variable $ sql=$(cat <<EOF SELECT foo, bar FROM db WHERE foo=’baz’ EOF ) … Read more
Read the Advanced Bash-Scripting Guide Chapter 19. Here Documents. Here’s an example which will write the contents to a file at /tmp/yourfilehere cat << EOF > /tmp/yourfilehere These contents will be written to the file. This line is indented. EOF Note that the final ‘EOF’ (The LimitString) should not have any whitespace in front of … Read more
Update: ECMAScript 6 (ES6) introduces a new type of literal, namely template literals. They have many features, variable interpolation among others, but most importantly for this question, they can be multiline. A template literal is delimited by backticks: var html = ` <div> <span>Some HTML here</span> </div> `; (Note: I’m not advocating to use HTML … Read more