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You can use

#!/bin/bash
FILE=$1
exec 3<$FILE
while read -u 3 host; do
    $2 $host $3
done

Then if you have:

$ cat /tmp/hostnames
some.host1.com
another.host2.net
some.host3.org    
some.host4.com

and run dofor.sh /tmp/hostnames ssh ls, it will run in sequence:

ssh some.host1.com ls
ssh another.host2.net ls
ssh some.host3.org ls
ssh some.host4.com ls

EDIT1:

If you'd like to change ssh or ls into some longer commands (or parts of such), just use quotes:

dofor.sh /tmp/hostnames "ssh -p 23" "ls -lh /"

EDIT2:

With the following script, you'll be able to use $host variable in as many places in your command as you want:

#!/bin/bash
exec 3<$1
while read -u 3 host; do
    eval $2
done

(I made this one shorter - no useless introducing of $FILE variable.) The important part here is that you need to use single quotes around the command containing the $host variable:

 dofor.sh /tmp/hostnames 'echo "trying $host :"; ssh -p 23 myuser@$host "ls -lh /"'

But beware that it is dangerous to use eval (see l0b0's wall) because if the file /tmp/hostnames contained a command on some line, it would be executed. Better not use this as root!

You can use

#!/bin/bash
FILE=$1
exec 3<$FILE
while read -u 3 host; do
    $2 $host $3
done

Then if you have:

$ cat /tmp/hostnames
some.host1.com
another.host2.net
some.host3.org    
some.host4.com

and run dofor.sh /tmp/hostnames ssh ls, it will run in sequence:

ssh some.host1.com ls
ssh another.host2.net ls
ssh some.host3.org ls
ssh some.host4.com ls

EDIT1:

If you'd like to change ssh or ls into some longer commands (or parts of such), just use quotes:

dofor.sh /tmp/hostnames "ssh -p 23" "ls -lh /"

EDIT2:

With the following script, you'll be able to use $host variable in as many places in your command as you want:

#!/bin/bash
exec 3<$1
while read -u 3 host; do
    eval $2
done

(I made this one shorter - no useless introducing of $FILE variable.) The important part here is that you need to use single quotes around the command containing the $host variable:

 dofor.sh /tmp/hostnames 'echo "trying $host :"; ssh -p 23 myuser@$host "ls -lh /"'

But beware that it is dangerous to use eval (see l0b0's wall) because if the file /tmp/hostnames contained a command on some line, it would be executed. Better not use this as root!

You can use

#!/bin/bash
FILE=$1

while read -u 3 host; do
    $2 $host $3
done 3 < $FILE

Then if you have:

$ cat /tmp/hostnames
some.host1.com
another.host2.net
some.host3.org    
some.host4.com

and run dofor.sh /tmp/hostnames ssh ls, it will run in sequence:

ssh some.host1.com ls
ssh another.host2.net ls
ssh some.host3.org ls
ssh some.host4.com ls

EDIT1:

If you'd like to change ssh or ls into some longer commands (or parts of such), just use quotes:

dofor.sh /tmp/hostnames "ssh -p 23" "ls -lh /"

EDIT2:

With the following script, you'll be able to use $host variable in as many places in your command as you want:

#!/bin/bash
while read -u 3 host; do
    eval $2
done 3 < $1

(I made this one shorter - no useless introducing of $FILE variable.) The important part here is that you need to use single quotes around the command containing the $host variable:

 dofor.sh /tmp/hostnames 'echo "trying $host :"; ssh -p 23 myuser@$host "ls -lh /"'

But beware that it is dangerous to use eval (see l0b0's wall) because if the file /tmp/hostnames contained a command on some line, it would be executed. Better not use this as root!

You can use

#!/bin/bash
FILE=$1
exec 3<$FILE
while read -u 3 host; do
    $2 $host $3
done

Then if you have:

$ cat /tmp/hostnames
some.host1.com
another.host2.net
some.host3.org    
some.host4.com

and run dofor.sh /tmp/hostnames ssh ls, it will run in sequence:

ssh some.host1.com ls
ssh another.host2.net ls
ssh some.host3.org ls
ssh some.host4.com ls

EDIT1:

If you'd like to change ssh or ls into some longer commands (or parts of such), just use quotes:

dofor.sh /tmp/hostnames "ssh -p 23" "ls -lh /"

EDIT2:

With the following script, you'll be able to use $host variable in as many places in your command as you want:

#!/bin/bash
exec 3<$1
while read -u 3 host; do
    eval $2
done

(I made this one shorter - no useless introducing of $FILE variable.) The important part here is that you need to use single quotes around the command containing the $host variable:

 dofor.sh /tmp/hostnames 'echo "trying $host :"; ssh -p 23 myuser@$host "ls -lh /"'

But beware that it is dangerous to use eval (see l0b0's wall) because if the file /tmp/hostnames contained a command on some line, it would be executed. Better not use this as root!

You can use

#!/bin/bash
FILE=$1

while read -u 3 host; do
    $2 $host $3
done 3 < $FILE

Then if you have:

$ cat /tmp/hostnames
some.host1.com
another.host2.net
some.host3.org    
some.host4.com

and run dofor.sh /tmp/hostnames ssh ls, it will run in sequence:

ssh some.host1.com ls
ssh another.host2.net ls
ssh some.host3.org ls
ssh some.host4.com ls

EDIT1:

If you'd like to change ssh or ls into some longer commands (or parts of such), just use quotes:

dofor.sh /tmp/hostnames "ssh -p 23" "ls -lh /"

EDIT2:

With the following script, you'll be able to use $host variable in as many places in your command as you want:

#!/bin/bash
while read -u 3 host; do
    eval $2
done 3 < $1

(I made this one shorter - no useless introducing of $FILE variable.) The important part here is that you need to use single quotes around the command containing the $host variable:

 dofor.sh /tmp/hostnames 'echo "trying $host :"; ssh -p 23 myuser@$host "ls -lh /"'

You can use

#!/bin/bash
FILE=$1

while read -u 3 host; do
    $2 $host $3
done 3 < $FILE

Then if you have:

$ cat /tmp/hostnames
some.host1.com
another.host2.net
some.host3.org    
some.host4.com

and run dofor.sh /tmp/hostnames ssh ls, it will run in sequence:

ssh some.host1.com ls
ssh another.host2.net ls
ssh some.host3.org ls
ssh some.host4.com ls

EDIT1:

If you'd like to change ssh or ls into some longer commands (or parts of such), just use quotes:

dofor.sh /tmp/hostnames "ssh -p 23" "ls -lh /"

EDIT2:

With the following script, you'll be able to use $host variable in as many places in your command as you want:

#!/bin/bash
while read -u 3 host; do
    eval $2
done 3 < $1

(I made this one shorter - no useless introducing of $FILE variable.) The important part here is that you need to use single quotes around the command containing the $host variable:

 dofor.sh /tmp/hostnames 'echo "trying $host :"; ssh -p 23 myuser@$host "ls -lh /"'

But beware that it is dangerous to use eval (see l0b0's wall) because if the file /tmp/hostnames contained a command on some line, it would be executed. Better not use this as root!