var-1bs
printf "%s=:%s:\n" VAR1BS 111\\111;   printf "%s=:%s:\n" VAR1BSa 111\\aaa;   printf "%s=:%s:\n" VAR1BSA 111\\aaa;   printf "%s=:%s:\n" VAR1BSda 111\\\$\{a\};   printf "%s=:%s:\n" VAR1BSdA 111\\\$\{A\};   printf "%s=:%s:\n" VAR1BSc 111\#\ backslash\ escapes\ comment\ char,\ so\ this\ is\ part\ of\ the\ value;   printf "%s=:%s:\n" VAR1BSsc 111\\\ ; 
VAR1BS=:111\111:
VAR1BSa=:111\aaa:
VAR1BSA=:111\aaa:
VAR1BSda=:111\${a}:
VAR1BSdA=:111\${A}:
VAR1BSc=:111# backslash escapes comment char, so this is part of the value:
VAR1BSsc=:111\ :
var-2bs
printf "%s=:%s:\n" VAR2BS 222\\\\222;   printf "%s=:%s:\n" VAR2BSa 222\\\\aaa;   printf "%s=:%s:\n" VAR2BSA 222\\\\aaa;   printf "%s=:%s:\n" VAR2BSda 222\\\\\$\{a\};   printf "%s=:%s:\n" VAR2BSdA 222\\\\\$\{A\};   printf "%s=:%s:\n" VAR2BSc 222\\\\;   printf "%s=:%s:\n" VAR2BSsc 222\\\\; 
VAR2BS=:222\\222:
VAR2BSa=:222\\aaa:
VAR2BSA=:222\\aaa:
VAR2BSda=:222\\${a}:
VAR2BSdA=:222\\${A}:
VAR2BSc=:222\\:
VAR2BSsc=:222\\:
var-1bsnl
printf "%s=:%s:\n" VAR1BSNL 111\ 111;   printf "%s=:%s:\n" VAR1BSNLa 111\ aaa;   printf "%s=:%s:\n" VAR1BSNLA 111\ aaa;   printf "%s=:%s:\n" VAR1BSNLda 111\ \$\{a\};   printf "%s=:%s:\n" VAR1BSNLdA 111\ \$\{A\};   printf "%s=:%s:\n" VAR1BSNLc 111;   printf "%s=:%s:\n" VAR1BSNLsc 111; 
VAR1BSNL=:111 111:
VAR1BSNLa=:111 aaa:
VAR1BSNLA=:111 aaa:
VAR1BSNLda=:111 ${a}:
VAR1BSNLdA=:111 ${A}:
VAR1BSNLc=:111:
VAR1BSNLsc=:111:
var-2bsnl
printf "%s=:%s:\n" VAR2BSNL 222\\\\;   printf "%s=:%s:\n" VAR2BSNLa 222\\\\;   printf "%s=:%s:\n" VAR2BSNLA 222\\\\;   printf "%s=:%s:\n" VAR2BSNLda 222\\\\;   printf "%s=:%s:\n" VAR2BSNLdA 222\\\\;   printf "%s=:%s:\n" VAR2BSNLc 222\\\\;   printf "%s=:%s:\n" VAR2BSNLsc 222\\\\; 
VAR2BSNL=:222\\:
VAR2BSNLa=:222\\:
VAR2BSNLA=:222\\:
VAR2BSNLda=:222\\:
VAR2BSNLdA=:222\\:
VAR2BSNLc=:222\\:
VAR2BSNLsc=:222\\:
var-3bsnl
printf "%s=:%s:\n" VAR3BSNL 333\\\\\ 333=;   printf "%s=:%s:\n" VAR3BSNLa 333\\\\\ aaa=;   printf "%s=:%s:\n" VAR3BSNLA 333\\\\\ aaa=;   printf "%s=:%s:\n" VAR3BSNLda 333\\\\\ \$\{a\}=;   printf "%s=:%s:\n" VAR3BSNLdA 333\\\\\ \$\{A\}=;   printf "%s=:%s:\n" VAR3BSNLc 333\\\\;   printf "%s=:%s:\n" VAR3BSNLsc 333\\\\; 
VAR3BSNL=:333\\ 333=:
VAR3BSNLa=:333\\ aaa=:
VAR3BSNLA=:333\\ aaa=:
VAR3BSNLda=:333\\ ${a}=:
VAR3BSNLdA=:333\\ ${A}=:
VAR3BSNLc=:333\\:
VAR3BSNLsc=:333\\:
var-1bsnl-space
printf "%s=:%s:\n" VAR1BSNL00 first\ line;   printf "%s=:%s:\n" VAR1BSNL0 first\ line\ no\ space\ on\ second\ line;   printf "%s=:%s:\n" VAR1BSNLs first\ line\ one\ space\ on\ second\ line;   printf "%s=:%s:\n" VAR1BSNLss first\ line\ two\ spaces\ on\ second\ line;   printf "%s=:%s:\n" VAR1BSNLt first\ line\ one\ tab\ on\ second\ line;   printf "%s=:%s:\n" VAR1BSNLtt first\ line\ two\ tabs\ on\ second\ line;   printf "%s=:%s:\n" VAR1BSNLxx first\ line\ many\ spaces\ and\ tabs\ \[\ \ \	\ \]\ on\ second\ line; 
VAR1BSNL00=:first line:
VAR1BSNL0=:first line no space on second line:
VAR1BSNLs=:first line one space on second line:
VAR1BSNLss=:first line two spaces on second line:
VAR1BSNLt=:first line one tab on second line:
VAR1BSNLtt=:first line two tabs on second line:
VAR1BSNLxx=:first line many spaces and tabs [  	 ] on second line:
cmd-1bsnl
echo :'first line\
#second line without space\
third line':
:first line\
#second line without space\
third line:
echo :'first line\
     second line spaces should be retained':
:first line\
     second line spaces should be retained:
echo :'first line\
second line tab should be elided':
:first line\
second line tab should be elided:
echo :'first line\
	only one tab should be elided, second tab remains'
:first line\
	only one tab should be elided, second tab remains
cmd-1bsnl-eof
echo :'command ending with backslash-newline'; \

:command ending with backslash-newline
cmd-2bsnl
echo take one\\
take one\
echo take two\\
take two\
echo take three\\
take three\
cmd-3bsnl
echo :'first line\\\
#second line without space\\\
third line':
:first line\\\
#second line without space\\\
third line:
echo :'first line\\\
     second line spaces should be retained':
:first line\\\
     second line spaces should be retained:
echo :'first line\\\
second line tab should be elided':
:first line\\\
second line tab should be elided:
echo :'first line\\\
	only one tab should be elided, second tab remains'
:first line\\\
	only one tab should be elided, second tab remains
exit status 0