I have a program written a while ago, with a Perl command line call, which I am having trouble deciphering. I think it may be using some older Perl syntax that I'm not familiar with (or possibly I am just not reading the line right). Here is the command: 
perl -ni -e's+${SOURCE}/${SAMS}/++g;s+${SOURCE}/${SAMLIB}/++g;s+${SOUR
+CE}/${SMCLIB}/+${SOURCE}/${KENO}/+g;if ( not m+^${SOURCE}/+ ) {s+${SO
+URCE}/+\$$\{OBJECT\}/+g;print}' .depend ;\
${SCALE}/cmds/Sort .depend )

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I have an understanding of the -n putting the code in a loop, the -i allowing to write to the same file, and the -e letting the command line act like code. I'm having trouble seeing what each Perl code "line" (the stuff between the ;'s) does, as well as if s+ was syntax for substitute or something else. If anyone can give a quick synopsis of what's going on I'd be quite grateful. Thanks!

~Jack

In reply to Command line question by igotlongestname

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