Homework & Coursework Questions

#!/bin/sh

mode=$1

shift 1 

ls -l |awk '{k=0;for(i=0;i<=8;i++)k+=((substr($1,i+2,1)~/[rwx]/) \
         *2^(8-i));if(k)printf("%0o ",k);print }'|grep "$mode"

man find

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 
$

#!/bin/sh
perm=$1
shift
find . -perm $perm $* {} \;

man find

#!/bin/sh

permission=$1

shift

find . -maxdepth 1 -perm $permission -exec $* {} \;