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19920763
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2013-11-12T04:17:38.303
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2013-11-12T04:58:26.007
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Body
Given that it is <code>bash</code>, you can do: <pre><code> printf "%.4o\n" $(( $(stat -f '0%Lp' "$file") & ~$(umask) )) </code></pre> at least, on Mac OS X, where <code>stat -f '%Lp'</code> means 'print the user, group, other permissions in octal'. If you're on Linux, you'll need to translate that to the GNU <code>stat</code> syntax, which looks like it probably is: <pre><code>printf "%.4o\n" $(( $(stat --printf '%a' "$file") & ~$(umask) )) </code></pre> The spaces after <code>$((</code> and before <code>))</code> are not strictly needed in the sense that the shell knows what to do even if they are missing; likewise the spaces around the <code>&</code>. OTOH, if anyone else has to read the code, you probably want those spaces there. <hr> Test code: <pre><code>file="./mode-file" trap "rm -f $file; exit 1" 0 1 2 3 13 15 cp /dev/null "$file" for mode in 777 755 644 640 444 440 400 do chmod $mode $file ls -l $file for umask in 002 022 027 033 037 077 177 do umask $umask printf "$mode & ~$umask = %.4o\n" $(( $(stat -f '0%Lp' "$file") & ~$(umask) )) done done rm -f $file trap 0 </code></pre> Example output: <pre><code>-rwxrwxrwx 1 jleffler staff 0 Nov 11 20:57 ./mode-file 777 & ~002 = 0775 777 & ~022 = 0755 777 & ~027 = 0750 777 & ~033 = 0744 777 & ~037 = 0740 777 & ~077 = 0700 777 & ~177 = 0600 -rwxr-xr-x 1 jleffler staff 0 Nov 11 20:57 ./mode-file 755 & ~002 = 0755 755 & ~022 = 0755 755 & ~027 = 0750 755 & ~033 = 0744 755 & ~037 = 0740 755 & ~077 = 0700 755 & ~177 = 0600 -rw-r--r-- 1 jleffler staff 0 Nov 11 20:57 ./mode-file 644 & ~002 = 0644 644 & ~022 = 0644 644 & ~027 = 0640 644 & ~033 = 0644 644 & ~037 = 0640 644 & ~077 = 0600 644 & ~177 = 0600 -rw-r----- 1 jleffler staff 0 Nov 11 20:57 ./mode-file 640 & ~002 = 0640 640 & ~022 = 0640 640 & ~027 = 0640 640 & ~033 = 0640 640 & ~037 = 0640 640 & ~077 = 0600 640 & ~177 = 0600 -r--r--r-- 1 jleffler staff 0 Nov 11 20:57 ./mode-file 444 & ~002 = 0444 444 & ~022 = 0444 444 & ~027 = 0440 444 & ~033 = 0444 444 & ~037 = 0440 444 & ~077 = 0400 444 & ~177 = 0400 -r--r----- 1 jleffler staff 0 Nov 11 20:57 ./mode-file 440 & ~002 = 0440 440 & ~022 = 0440 440 & ~027 = 0440 440 & ~033 = 0440 440 & ~037 = 0440 440 & ~077 = 0400 440 & ~177 = 0400 -r-------- 1 jleffler staff 0 Nov 11 20:57 ./mode-file 400 & ~002 = 0400 400 & ~022 = 0400 400 & ~027 = 0400 400 & ~033 = 0400 400 & ~037 = 0400 400 & ~077 = 0400 400 & ~177 = 0400 </code></pre> NB: Tested on Mac OS X 10.9 (Mavericks). If you are using a GNU/Linux platform, you must change the <code>stat</code> command to use the notation that works on your machine.
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1. This table or related slice is empty.
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1. POWorking with octal permissions in bash
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1. USJonathan Leffler
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1. USJonathan Leffler
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1. POWorking with octal permissions in bash
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