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Re: USe Shell comands in perl

by cdarke (Prior)
on Jul 17, 2007 at 09:23 UTC ( #626986=note: print w/ replies, xml ) Need Help??


in reply to USe Shell comands in perl

While there are some occasions that using shell commands from Perl are justified, there are many more when they are not. Decide: use the shell OR use Perl. Mixing them is to encourage inefficiency.
This is a rough conversion table from UNIX commands to Perl. Please note that there are not always direct single equivalents, and that there are certainly many more that I can't think of (but many others will).
UNIXPerlOrigin
. do built-in
awk perl ;-) (often 'split') built-in
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
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 Base module
ftp Net::Ftp Base module
function sub built-in
grep see egrep
integer int built-in
kill kill built-in
ln -s link 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
rand rand built-in
rm unlink built-in
ExtUtils::Command::rm Base module
rm f ExtUtils::Command::rm_rf Base module
sed s/// (usually) built-in
select Shell::POSIX::select CPAN
sleep sleep built-in
alarm built-in
sort sort built-in
source do built-in
tail File::Tail 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


Comment on Re: USe Shell comands in perl
Re^2: USe Shell comands in perl
by blazar (Canon) on Jul 17, 2007 at 10:12 UTC

    cdarke++, excellent article! Really this reply of mine may have been a /msg, but I wanted others to read it, and see if they share my feeling: have you considered (possibly expanding on the subject and) making it into a meditation? So one could refer to it for the future...

      Thanks blazar. Added to meditations as you suggested 627015. I suggest that monks wishing to add more to the list do so in the meditation.
Re^2: USe Shell comands in perl
by regexes (Hermit) on Jul 17, 2007 at 11:46 UTC
    I agree with blazar... excellent.

    What about adding?

    telnet Net::Telnet CPAN


    regexes
Re^2: USe Shell comands in perl
by jdporter (Canon) on Jul 17, 2007 at 13:59 UTC

    I think you need an "Origin" column for the UNIX side as well, since you seem to have thrown in external utilities, shell built-ins, and C library functions without distinction. (This is mainly meant as feedback for your other post.)

      I can see why you say that, it is this phrase "UNIX command" that is so commonly used but is really too general. Strictly I guess it should only contain names from the POSIX/SUS standard section "Shell&Utilities", but that would miss many out. I will try and apply a new column when I can.

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