#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