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Solbourne behavior of echo vs. backquotes?

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ea...@elroy.jpl.nasa.gov

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Sep 2, 1993, 6:21:57 PM9/2/93
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This is bizarre:

spirit:1:21 [/home/earle] % arch -k
Series6

spirit:1:22 [/home/earle] % head -1 /etc/motd
OS/MP 4.1B Export(SPIRIT/root)#1: Fri Apr 2 14:24:12 1993

spirit:1:23 [/home/earle] % uname -a
SunOS spirit 4.1B 4.1.2 sun4

spirit:1:24 [/home/earle] % tset -IQ -s -m 'unknown:xterm' -m 'dialup:vt100'\
-m 'dec-vt100:vt100' -m 'network:?vt100'
set noglob;
setenv TERM xterms ;
setenv TERMCAP 'v2|xterms|vs100s:li#24:co#80:cr=^M:do=^J:nl=^J:bl=^G:le=^H:ho=\E[H:cl=\E[H\E[2J:bs:am:cm=\E[%i%d;%dH:nd=\E[C:up=\E[A:ce=\E[K:cd=\E[J:so=\E[7m:se=\E[m:us=\E[4m:ue=\E[m:md=\E[1m:mr=\E[7m:me=\E[m:ku=\EOA:kd=\EOB:kr=\EOC:kl=\EOD:kb=^H:k1=\EOP:k2=\EOQ:k3=\EOR:k4=\EOS:ta=^I:pt:sf=\n:sr=\EM:al=\E[L:dl=\E[M:ic=\E[@:dc=\E[P:MT:ks=\E[?1h\E=:ke=\E[?1l\E>:is=\E[r\E[m\E[2J\E[H\E[?7h\E[?1;3;4;6l:rs=\E[r\E<\E[m\E[2J\E[H\E[?7h\E[?1;3;4;6l:xn:AL=\E[%dL:DL=\E[%dM:IC=\E[%d@:DC=\E[%dP:ti=\E7\E[?47h:te=\E[2J\E[

?47l\E8:hs:ts=\E[?E\E[?%i%dT:fs=\E[?F:es:ds=\E[?E:';
unset noglob;

spirit:1:25 [/home/earle] % echo `!!`
echo `tset -IQ -s -m 'unknown:xterm' -m 'dialup:vt100' -m 'dec-vt100:vt100' -m 'network:?vt100'`
set noglob; setenv TERM xterms ; setenv TERMCAP unset noglob;

spirit:1:26 [/home/earle] % sh
$ tset -IQ -s -m 'unknown:xterm' -m 'dialup:vt100' -m 'dec-vt100:vt100' -m 'network:?vt100'
set noglob;
setenv TERM xterms ;
setenv TERMCAP 'v2|xterms|vs100s:li#24:co#80:cr=^M:do=^J:nl=^J:bl=^G:le=^H:ho=\E[H:cl=\E[H\E[2J:bs:am:cm=\E[%i%d;%dH:nd=\E[C:up=\E[A:ce=\E[K:cd=\E[J:so=\E[7m:se=\E[m:us=\E[4m:ue=\E[m:md=\E[1m:mr=\E[7m:me=\E[m:ku=\EOA:kd=\EOB:kr=\EOC:kl=\EOD:kb=^H:k1=\EOP:k2=\EOQ:k3=\EOR:k4=\EOS:ta=^I:pt:sf=\n:sr=\EM:al=\E[L:dl=\E[M:ic=\E[@:dc=\E[P:MT:ks=\E[?1h\E=:ke=\E[?1l\E>:is=\E[r\E[m\E[2J\E[H\E[?7h\E[?1;3;4;6l:rs=\E[r\E<\E[m\E[2J\E[H\E[?7h\E[?1;3;4;6l:xn:AL=\E[%dL:DL=\E[%dM:IC=\E[%d@:DC=\E[%dP:ti=\E7\E[?47h:te=\E[2J\E[

?47l\E8:hs:ts=\E[?E\E[?%i%dT:fs=\E[?F:es:ds=\E[?E:';
unset noglob;
$ echo `tset -IQ -s -m 'unknown:xterm' -m 'dialup:vt100' -m 'dec-vt100:vt100' -m 'network:?vt100'`
set noglob; setenv TERM xterms ; setenv TERMCAP 'v2|xterms|vs100s:co#80:li#24:cr=^M:do=^J:nl=^J:bl=^G:le=^H:ho=\E[H:cl=\E[H\E[2J:bs:am:cm=\E[%i%d;%dH:nd=\E[C:up=\E[A:ce=\E[K:cd=\E[J:so=\E[7m:se=\E[m:us=\E[4m:ue=\E[m:md=\E[1m:mr=\E[7m:me=\E[m:ku=\EOA:kd=\EOB:kr=\EOC:kl=\EOD:kb=^H:k1=\EOP:k2=\EOQ:k3=\EOR:k4=\EOS:ta=^I:pt:sf=\n:sr=\EM:al=\E[L:dl=\E[M:ic=\E[@:dc=\E[P:MT:ks=\E[?1h\E=:ke=\E[?1l\E>:is=\E[r\E[m\E[2J\E[H\E[?7h\E[?1;3;4;6l:rs=\E[r\E<\E[m\E[2J\E[H\E[?7h\E[?1;3;4;6l:xn:AL=\E[%dL:DL=\E[%dM:IC=\E[%d@:DC

=\E[%dP:ti=\E7\E[?47h:te=\E[2J\E[?47l\E8:hs:ts=\E[?E\E[?%i%dT:fs=\E[?F:es:ds=\E[?E:'; unset noglob;

Why do both "tcsh" and "csh" lose their cookies on the TERMCAP string when it
is echo'd (or eval'd) inside backquotes?!?

Thanks,

- Greg

--
Greg Earle Inet: ea...@elroy.JPL.NASA.GOV
Sterling Software/Jet Propulsion Laboratory UUCP: ...!elroy!earle
Section-wide Member of Technical Staff Phone: (818) 354-6007
Image Processing Applications and Development FAX: (818) 393-6962

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