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looking for help on script to capture file permission.

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Top Forums Shell Programming and Scripting looking for help on script to capture file permission.
# 8  
Old 11-15-2010
One way. Inefficient but works for me. Based originally on a post on unix.com which used "dc" and totaly re-written to ensure that we always present a 4-digit octal number to "chmod" because Oracle makes use of SUID and SGID.

Code:
find /opt/ora10g/oracle -type f -print|while read filename
do
        # 10 character permissions from "ls"
        perms=`ls -lad "${filename}"|awk '{print $1}'`
        #
        # Convert to four 3-digit binary numbers
        binary1=`echo "${perms}"|cut -c4,7,10|tr xstST- 011110`
        binary2=`echo "${perms}"|cut -c2-4|tr rwsxtST- 11111000`
        binary3=`echo "${perms}"|cut -c5-7|tr rwsxtST- 11111000`
        binary4=`echo "${perms}"|cut -c8-10|tr rwsxtST- 11111000`
        #
        # Convert binary to octal
        octal1=`echo "obase=8;ibase=2;${binary1}"|bc`
        octal2=`echo "obase=8;ibase=2;${binary2}"|bc`
        octal3=`echo "obase=8;ibase=2;${binary3}"|bc`
        octal4=`echo "obase=8;ibase=2;${binary4}"|bc`
        #
        # Concatonate each octal digit
        octal="${octal1}${octal2}${octal3}${octal4}"
        # Output the final "chmod" command
        echo "chmod ${octal} \"${filename}\""
done

Last edited by methyl; 11-15-2010 at 01:24 PM.. Reason: lose the sort and other test code
# 9  
Old 11-15-2010
It could be shorten a little bit
like

Code:
...
binary1=`echo "$1"|cut -c4,7,10|tr xstST- 011110`
binary2=`echo "$1"|cut -c2-10|tr rwsxtST- 11111000`
# Convert binary to octal
octal=`echo "obase=8;ibase=2;${binary1}${binary2}"|bc`
echo "$octal"
...

This User Gave Thanks to ctsgnb For This Post:
methyl
# 10  
Old 11-15-2010
Interesting ctsgnb. By concatonating the binary before executing "bc" you avoid the issue with leading zeros. I haven't tested it but on paper it looks good.

There will be a more efficient solution but it is important that a solution gives the correct answer.


Btw. anurag.singh was close but does not take into account SUID, SGID or Sticky Bit.

To be fair to the person who posted the version using "tr" and "dc", here is the link:
https://www.unix.com/shell-programmin...sh-script.html
The post was quite close to the solution but did not properly deal with permissions containing the Sticky Bit, had issues with leading zeros in octal, and had a couple of minor bugs. The IDEA of using "tr" twice was brilliant and I commend the poster for this.
Last edited by methyl; 11-15-2010 at 08:48 PM.. Reason: Complete backtrack
# 11  
Old 11-16-2010
as far as i have tested, it gives a correct result :

Code:
conv_perm(){
binary1=`echo "$1"|cut -c4,7,10|tr xstST- 011110`
binary2=`echo "$1"|cut -c2-10|tr rwsxtST- 11111000`
octal=`echo "obase=8;ibase=2;${binary1}${binary2}"|bc`
echo "$octal"
}

$ ls -l dbs* | awk '{print$1,$9}'
-rwxr-xr-x dbshut
-rwsr-s--- dbsnmp
-rwxr-xr-x dbsnmp0
-rwxr-xr-x dbsnmpj
-rw-r--r-- dbsnmpj0
-rwsr-s--- dbsnmp.sav
-rwxr-xr-x dbsnmpwd
-rwxr-xr-x dbstart
$ ls -l dbs* | while read a b b b b b b b b
> do
> printf "%4d %s\n" $(conv_perm $a) $b
> done
 755 dbshut
6750 dbsnmp
 755 dbsnmp0
 755 dbsnmpj
 644 dbsnmpj0
6750 dbsnmp.sav
 755 dbsnmpwd
 755 dbstart
$
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