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sam: make current filename available to shell commands in $f (thanks aiju)

--- a/sys/src/cmd/sam/shell.c

+++ b/sys/src/cmd/sam/shell.c

@@ -93,6 +93,7 @@

 			close(0);	/* so it won't read from terminal */

 			open("/dev/null", 0);

 		}

+		putenv("f", Strtoc(&f->name));

 		execl(SHPATH, SH, "-c", Strtoc(&plan9cmd), nil);

 		exits("exec");

 	}