Create a listing of all possible permissions and their octal representation.

touch /tmp/$$;for N in `seq -w 0 7777|grep -v [89]`; do chmod $N /tmp/$$; P=`ls -l /tmp/$$ | awk '{print $1}'`; echo $N $P; done;rm /tmp/$$

3
By: jyoder
2009-03-05 15:24:41

What Others Think

awesome
linuxrawkstar · 802 weeks and 5 days ago
Interesting, but is there actually any practical application?
goodevilgenius · 802 weeks and 5 days ago
Practical? Eh. I have a buddy that just can't seem to understand setting perms and how the different octal values work. So I wrote this for him. I was assuming that looking at the patterns would help explain what value impacted what permission, but instead he saved it to a file and just searches for the permission string he wants. I guess it works either way. :D
jyoder · 802 weeks and 5 days ago
I'd never use $$ for temporary files, better use mktemp.
OJM · 802 weeks and 5 days ago
There are several problems with this: * The use of /tmp/$$ isn't portable across shells, making it a Bash-ism. As already mentioned, use mktmep, or just choose an actual filename, like /tmp/FILE. If you insist on '$$', then quote it, as should be the first rule of all shell variables and filenames. * The use of backticks is a nightmare for maintenance and readability. Use $() instead. Unless you absolutely need portability to the archaic Unix shells, such as Bourne, $() is much more readable and functional. * The for loop is looping through numbers 0 to 7777, but our binary friends for permissions don't include permissions with the number '8' or '9' like 0999 or 3898, and so forth. Bit-shifting should be used here. * Further, the grep -v [89] is another Bash-ism, making this "one-liner" non-portable. * The endless scroll of nearly 7000 lines isn't teaching anything to anybody. Instead of the endless scrollback, the user should be asked for input, the input should be validated as a permission, then echoed back in octal to show the permission set. It's clean, and it actually teaches. * This is why shell-scripting sucks. Rather, use a more capable language, such as Perl, Python or Ruby. Shell scripts should only be used as simple solutions to simple problems.
atoponce · 802 weeks and 3 days ago
@stoponce: /tmp/$$ is portable. Even Sun's braindead /bin/sh (which is far from POSIX compliance) understands it. It doesn't understand $(), though. Looping from 0 to 7777 (decimal) and then removing all numbers that contain the digits 8 or 9 is a perfect way to generate octal numbers. There's no need for bit-shifting here. grep -v [89] is not a bashism, but it will fail if the current directory happens to contain a file named "8" or "9" (or both), whether bash or another shell. Therefore the pattern needs to be put in quotes.
inof · 790 weeks ago
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donperi1 · 45 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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