I'm guessing that ${SOURCE} and friends are being interpolated somehow (even though they're in single quotes)

Those quotes are processed by the shell. In the bourne shell or a derivative like bash, single quote don't perform any interpolation. 

$ echo "${PATH}"
.:/home/ikegami/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/gam
+es
$ echo '${PATH}'
${PATH}

[download]

( Here on end, assuming the bourne shell or a derivative like bash )

So Perl sees 

BEGIN { $^I = ''; }
while (<>) {
    s+${SOURCE}/${SAMS}/++g;
    s+${SOURCE}/${SAMLIB}/++g;
    s+${SOURCE}/${SMCLIB}/+${SOURCE}/${KENO}/+g;
    if ( not m+^${SOURCE}/+ ) {
         s+${SOURCE}/+\$$\{OBJECT\}/+g;
         print
    }
}

[download]

On the other hand, Perl regexp and replace expressions *do* interpolate. So the above is equivalent to 

BEGIN { $^I = ''; }
while (<>) {
    s+//++g;
    s+//++g;
    s+//+//+g;
    if ( not m+^/+ ) {
         s+/+\${OBJECT}/+g;
         print
    }
}

[download]

Depending on what the OP wants to do, he needs to use -e"" instead of -e'', to escape the dollar signs, or to define those variables in Perl.

In reply to Re^2: Command line question by ikegami
in thread Command line question by igotlongestname

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