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preserving backslash-newlines in heredocs run in a subshell

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0

So long as terminal backslashes are not present, the newlines of a heredoc are preserved after capturing the output of a heredoc in a variable:

var=$(cat <<-EOF

a

b

c

EOF

)

echo "$var"



a

b

c

Newlines are lost, however, when trying to store backslash-newlines:

var=$(cat <<-EOF

a \

b \

c

EOF

)



echo "$var"

a b c

Adding additional backslashes for further escaping does not help.

Of course, when not run in a subshell, a heredoc can be used to generate lines that end in backslash-newline:

$ cat <<-EOF

a \

b \

c

EOF

a 

b 

c

To circumvent this problem, one can add a newline delimiter to generate the desired output by a transformation of the variable:

var=$(cat <<-EOF

a \@

b \@

c

EOF

)



tr -d '@' <<<"$var"



a 

b 

c

Is there a more straightforward way to preserve backslash-newlines from heredocs run in subshells?

bash here-document

share|improve this question

edited 3 hours ago

user001

asked 3 hours ago

user001user001

1,72033 gold badges2121 silver badges4141 bronze badges

add a comment | 

0

So long as terminal backslashes are not present, the newlines of a heredoc are preserved after capturing the output of a heredoc in a variable:

var=$(cat <<-EOF

a

b

c

EOF

)

echo "$var"



a

b

c

Newlines are lost, however, when trying to store backslash-newlines:

var=$(cat <<-EOF

a \

b \

c

EOF

)



echo "$var"

a b c

Adding additional backslashes for further escaping does not help.

Of course, when not run in a subshell, a heredoc can be used to generate lines that end in backslash-newline:

$ cat <<-EOF

a \

b \

c

EOF

a 

b 

c

To circumvent this problem, one can add a newline delimiter to generate the desired output by a transformation of the variable:

var=$(cat <<-EOF

a \@

b \@

c

EOF

)



tr -d '@' <<<"$var"



a 

b 

c

Is there a more straightforward way to preserve backslash-newlines from heredocs run in subshells?

bash here-document

share|improve this question

edited 3 hours ago

user001

asked 3 hours ago

user001user001

1,72033 gold badges2121 silver badges4141 bronze badges

add a comment | 

So long as terminal backslashes are not present, the newlines of a heredoc are preserved after capturing the output of a heredoc in a variable:

var=$(cat <<-EOF

a

b

c

EOF

)

echo "$var"



a

b

c

Newlines are lost, however, when trying to store backslash-newlines:

var=$(cat <<-EOF

a \

b \

c

EOF

)



echo "$var"

a b c

Adding additional backslashes for further escaping does not help.

Of course, when not run in a subshell, a heredoc can be used to generate lines that end in backslash-newline:

$ cat <<-EOF

a \

b \

c

EOF

a 

b 

c

To circumvent this problem, one can add a newline delimiter to generate the desired output by a transformation of the variable:

var=$(cat <<-EOF

a \@

b \@

c

EOF

)



tr -d '@' <<<"$var"



a 

b 

c

Is there a more straightforward way to preserve backslash-newlines from heredocs run in subshells?

bash here-document

share|improve this question

edited 3 hours ago

user001

asked 3 hours ago

user001user001

1,72033 gold badges2121 silver badges4141 bronze badges

var=$(cat <<-EOF

a

b

c

EOF

)

echo "$var"



a

b

c

var=$(cat <<-EOF

a \

b \

c

EOF

)



echo "$var"

a b c

$ cat <<-EOF

a \

b \

c

EOF

a 

b 

c

var=$(cat <<-EOF

a \@

b \@

c

EOF

)



tr -d '@' <<<"$var"



a 

b 

c

share|improve this question

edited 3 hours ago

user001

asked 3 hours ago

user001user001

1,72033 gold badges2121 silver badges4141 bronze badges

share|improve this question

edited 3 hours ago

user001

asked 3 hours ago

user001user001

1,72033 gold badges2121 silver badges4141 bronze badges

asked 3 hours ago

user001user001

1,72033 gold badges2121 silver badges4141 bronze badges

asked 3 hours ago

user001user001

1,72033 gold badges2121 silver badges4141 bronze badges