Thank you for your help.
As below is the output of each comment
ls /home/john/nwchem-6.8.1/
bin
contrib
doc
examples
INSTALL
INSTALL.binbuilds
lib
LICENSE.TXT
QA
README.md
release.notes.3.2.1
release.notes.3.3
release.notes.4.0
release.notes.4.1
release.notes.4.5
release.notes.4.6
release.notes.4.7
release.notes.5.0
release.notes.5.1
release.notes.5.1.1
release.notes.6.0
release.notes.6.1
release.notes.6.8
release.notes.6.8.1
src
travis
web
ls /home/john/nwchem-6.8.1/src/config
32_to_64
32_to_64.pl
64_to_32
64_to_32.pl
census.skeleton
da_rec_size.f
data.64_to_32
data.check.pl
data.dbl2sngl
dbl2sngl.pl
dbl_to_sngl
dbl_to_sngl.2.sed
dbl_to_sngl.sed
depend.c
find_useblas
GNUmakefile
has_blas
hasblas.pl
has_dblas
hasdblas.pl
has_sblas
hassblas.pl
HOW_TO_ADD_A_MODULE
HOW_TO_CONFIGURE
lockfile
makefile.h
makefile-legacy.h
makelib.h
make_nwchem_config
modulesdep.py
NTenv.bash
NTenv.bat
NTmakefile.h
NTmakelib.h
NWCHEM_CONFIG
nwchem_config.h
nwchem_config_win32.h
show_blas
showblas.pl
show_dblas
showdblas.pl
show_sblas
showsblas.pl
simpledepend
sngl2dbl.pl
sngl_to_dbl
sngl_to_dbl.2.sed
sngl_to_dbl.sed
stripdepend
stub.skeleton
util_module_avail_F.begin
util_module_avail_F.end
win32
head /home/john/nwchem-6.8.1/src/config/64_to_32
/home/john/nwchem-6.8.1/src/config/64_to_32
which csh
no output
which perl
/usr/bin/perl
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