If you have a fixed number of elements that are either strings or non-sequential numbers, use this form of the for loop. This syntax matches Python.

for i in 5,10,3,-8
  Print (i)

5
10
3
-8

for text in 'Hi!','I am','Yami..'
  Print (text)

Hi!
I am
Yami..

And you can also loop over the content of a file:

for id in file /home/yasara/pdb_id.txt
  Clear
  LoadPDB (id)
  CountRes all

In the example above, the file pdb_id.txt contains a list of PDB IDs to loop over. In this simple text file, you can use either commas or linefeeds to separate the elements:

# Example for valid loop-file:
# Line starting with '#' are ignored.

# Using linefeeds to separate
1CRN
5TIM

# Using commas to separate
1SOL, 1STY,1THV

# By default, strings are weak strings, single quotes are not essential:
'1RIS', '1RWT'

# Double quotes are needed to specify strong strings:
"1VII","1YAS"

# Integers and floats are also allowed:
1,2,3
5.7, -1e60