Potgen

This script will help you to make automatically a POTCAR file.

#!/bin/bash
# Create a GGA_PAW POTCAR file by concatenation of POTCAR files
# D.K. version 2010-07-08 TGN

# Define local potpaw_GGA pseudopotential repository:
repo="/media/RGARGIA-WAREHOUSE/pseudopotentials/PP5_PBE" 

# Check if older version of POTCAR is present
if [ -f POTCAR ] ; then
 mv -f POTCAR old-POTCAR
 echo " ** Warning: old POTCAR file found and renamed to 'old-POTCAR'."
fi 

# Main loop - concatenate the appropriate POTCARs (or archives)
for i in $*
do
 if test -f $repo/$i/POTCAR ; then
  cat $repo/$i/POTCAR >> POTCAR
 elif test -f $repo/$i/POTCAR.Z ; then
  zcat $repo/$i/POTCAR >> POTCAR
 elif test -f $repo/$i/POTCAR.gz ; then
  gunzip -c $repo/$i/POTCAR.gz >> POTCAR
 else
  echo " ** Warning: No suitable POTCAR for element '$i' found!! Skipped this element."
 fi
done

Example:

./potcar.sh C_s H O_s Au Pt