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Re: Comment Stripper script for unix

by Abigail-II (Bishop)
on Jun 14, 2004 at 15:06 UTC ( #366571=note: print w/ replies, xml ) Need Help??


in reply to Comment Stripper script for unix

Input:

#!/bin/bash # This is a comment. echo "# This is not a comment" echo \# and neither is this.
Output:
echo " echo \
Your program will strip she-bang lines unless such a line starts with whitespace. However, whitespace isn't optional. The first 2 bytes of the file need to be #!, the kernel isn't going to skip over whitespace (and whitespace certainly isn't mandatory). Furthermore, the base of your program is an extremely symplistic regex - it just removes anything on a line starting at the first #. Your program could as well have been:
perl -nle 's/#.*//; print if /\S/'

But my biggest question is, why do you think this is useful for system administration? I don't know any system administrator who wants to remove comments from his configuration files or from his shell scripts.

Abigail


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Re^2: Comment Stripper script for unix
by coreolyn (Parson) on Jun 14, 2004 at 15:10 UTC

    This is an annoying trend that's driving me nuts where I work to.. Somehow they are justifying it in the name of security. ( Even to the point of stripping comments from all applications.)

      I tend to ask people to elaborate on that, and ask them to explain how this is helping security. I also might point out that $ > /secret/file works even better (sure, it has some side-effects, but isn't security important enough that we can justify some side-effects?)

      Abigail

Re^2: Comment Stripper script for unix
by hsinclai (Deacon) on Jun 14, 2004 at 15:35 UTC
    Hi Abigail,

    Your program will strip she-bang lines unless such a line starts with whitespace.
    Are you sure about that? The shebang line is not stripped, if it is the first line, which gets preserved and re-inserted back into the final output..
    update- you're totally right about that, I screwed it up..

    why do you think this is useful for system administration..

    Because removing commented lines lets you get a quick view only of active lines - in a file that might have only a few active lines among several screens of commented lines, e.g. a stock squid.conf file..

    Thanks for the feedback!
      Because removing commented lines lets you get a quick view only of active lines - in a file that might have only a few active lines among several screens of commented lines, e.g. a stock squid.conf file..
      Well, a simple grep -v ^\# will do that. If an "active" line has a trailing comment, it doesn't matter. It also doesn't explain why you want to remove comments from a shell script.

      Abigail

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