Shell Script To Run Commands In Users Home Directory

#Next line tell with shell to use
#!/bin/bash

#we store in variable path to file
UserListFile=/tmp/user.list

#We create function with name Usage
Usage () {

#printing help
echo “$0 – execute command in all HOME directories

usage: $0 [-a] command [arg ...]

-a: process HOME directories of all users

The given command will be executed with the arguments specified in the

home directory of users.

”

#exit from program
exit 1

#end of function
}

#we check if there less than 1 parameter
if [ $# -lt 1 ]

then

#if less – print help
Usage

#in other case
else

#we check passed parameters, starting from first
case “$1″ in

#if parameter -a then we write to All variable value true
-a) All=true

#removing parameter
shift ;;

#if parameter starting with -, and not -a, we print help
-*) Usage ;;

#exit from case
esac

#exit from fi loop
fi

#we check if user pass -a as parameter
if [ "$All" = true ]

#if -a passed
then

#we get list of all users
cat /etc/passwd | cut -d':’ -f1 | sed -e ‘s/:/ /g’ > $UserListFile

# in other case
else

#print message
echo “Please enter users, type [ to exit”

#cleaning file with userlist
echo -n > $UserListFile

#starting while loop to read users
while read UserName Rest

do

#if user print [ to exit loop
if [ $UserName = “[" ]; then

#exit from loop
break

#if user print other data
else
#we check if user put any symbol

test -z “$UserName” && continue
#we check if user exist
grep “^$UserName” /etc/passwd > /dev/null || {

#if not exist print message to user
echo “Can’t find user ${UserName}; ignored.”

#we continue loop
continue

}

#if user exist – we store it to userfile
echo $UserName >> $UserListFile

#exit of if loop
fi

#exit from reading user input
done

#exit from if loop
fi

#just print empty line
echo “”

#stop all other parameters as command we need to run
Command=”$@”

#getting list of users
UserList=`cat $UserListFile`

#getting user one by one from list
for user in ${UserList}

do

#one more empty line
echo “”

#getting user home directory
HomeDir=`grep “^$user” /etc/passwd | cut -d”:” -f6`

# we check if we have read and execute permissions to cd and run command
[ -r "$HomeDir" -a -x "$HomeDir" ] || {

# if not just warn user
echo “Read or execute of folder $HomeDir denied”

continue

#exit of check
}

#we telling user about what command we run and inside what directory
echo “Runnig $Command inside $HomeDir”

#entering home
cd $HomeDir

#running command
$Command

done
#cleaning, removing temp files
rm -rf $UserListFile

Sccript Output

./exec_home.sh ls

Please enter users, type exit to exit

sshd

yevhen

exit

Runnig ls inside /var/run/sshd

Runnig ls inside /home/yevhen

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