In response to blazar's suggestion in 626986:
This is a rough conversion table from UNIX commands to Perl.
Please note that there are not always direct single equivalents.

Please feel free to add more, there must be lots.

UNIX	Perl	Origin
.	do	built-in
awk	perl ;-) (often 'split')	built-in
	See also a2p	Base program
basename	File::Basename::basename	Base module
cat	while(<>){print}	built-in
	ExtUtils::Command::cat	Base module
cd	chdir	built-in
chmod	chmod	built-in
chown	chown	built-in
cp	File::Copy	Base module
	ExtUtils::Command::cp	Base module
cut	split	built-in
date	localtime	built-in
	POSIX::strftime	Base module
declare	see typedef
df	Filesys::Df	CPAN
diff	File::Compare	Base module
dirname	File::Basename::dirname	Base modules
echo	print	built-in
egrep	while(<>){print if /re/}	built-in
eval	eval	built-in
exec	exec	built-in
	pipe (co-processes)	built-in
	open (file descriptors)	built-in
export	Assign to %ENV	Hash variable
	Env::C	CPAN
find	File::Find::find	Base module
ftp	Net::Ftp	Base module
function	sub	built-in
grep	see egrep
hostname	Sys::Hostname::hostname	Base module
integer	int	built-in
kill	kill	built-in
ln	link	built-in
ln -s	symlink	built-in
ls	glob	built-in
	opendir/readdir/closedir	built-in
	stat/lstat	built-in
mkdir	mkdir	built-in
mkpath	ExtUtils::Command::mkpath	Base module
mv	rename	built-in
	ExtUtils::Command::mv	Base module
od	ord	built-in
	printf	built-in
print	print	built-in
printf	printf	built-in
ps	Proc::ProcessTable	CPAN
pwd	Cwd::getcwd	Base module
rand	rand	built-in
read	See I/O Operators	built-in
rm	unlink	built-in
	ExtUtils::Command::rm	Base module
rm -f	ExtUtils::Command::rm_rf	Base module
sed	s/// (usually)	built-in
	See also s2p	Base program
select	Shell::POSIX::select	CPAN
sleep	sleep	built-in
	alarm	built-in
sort	sort	built-in
source	do	built-in
tail	File::Tail	CPAN
telnet	Net::Telnet	CPAN>
times	times	built-in
touch	open/close	built-in
	ExtUtils::Command::touch	Base module
trap	%SIG	Hash
	sigtrap	pragma
typeset	my	built-in
typeset -i	int	built-in
typeset -l	lc	built-in
typeset -u	uc	built-in
typeset -Z	sprintf	built-in

updates: link/symlink, thanks to Crackers2
Net::Telnet added with thanks to regexes
a2p and s2p, thanks to Trizor
cut, thanks to RMGir
ps, thanks to Nasrudin

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