More than you ever wanted to know about # The first shell to use it as a comment was csh(1), Bill Joy did this. This was also pre #! in the kernel so the shell had to exec scripts, not the kernel. This had traditionally been done after the exec() failed then shell ould run "sh argv[0]", but with two shells this was now a problem. So csh would look at the first line of the script and if it was a #\n it would exec csh on it if not it would exec sh(1) on it. This was check was also placed into to BSD's (not v7 nor att's) bourne shell so it could run csh scripts as well. However this was not the first use of # as a comment character. That award goes to Brian Kernighan's ratfor(1) (rational fortran) compiler in 1974-75. Then Feldman used in make(1) in 1976, followed by Kernighan's m4(1), learn(1) and most famously awk(1) in 1977 Bourne shell, written around 1976, eventualy picked this up later on but after the initial v7 release. And as some noted the : was kind of a comment, it was a command that did an exit(0) orginally for labels for Thompson's shell's goto command. The : command was eventually hard linked to the true(1) command Remember # was hard to type on teletypes as that was the erase character, so to enter it, you needed to type \# (# as erase and @ as line kill came from multics btw) It was so hard to type that the orignal assember based on DEC PAL-11R, that addressing syntax changed @ to * and # to $. In DEC it would be-- MOV @X, R0; In UNIX asm it became -- mov *x, r0 So this is also why C pointers use * notation. -Brian