perlcritic: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/perlcritic - from package: perl-Perl-Critic

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/perlcritic - from package: libperl-critic-perl

You may install the required package with command apt-get install {package}

Error in other languages:
perlcritic: bevel nie gevind nie
perlcritic: comandă negăsită
perlcritic: comando não encontrado
perlcritic: commande introuvable
perlcritic: command not found
perlcritic: käsku ei ole
perlcritic: không tìm thấy lệnh
perlcritic: komanda nerasta
perlcritic: Kommando nicht gefunden.
perlcritic: kommandot finns inte
perlcritic: komut yok
perlcritic: nie znaleziono polecenia
perlcritic: níor aimsíodh an t-ordú
perlcritic: no se encontró la orden
perlcritic: no s'ha trobat l'ordre
perlcritic: opdracht niet gevonden
perlcritic: parancs nem található
perlcritic: perintah tidak ditemukan
perlcritic: príkaz nenájdený
perlcritic: příkaz nenalezen
perlcritic: команда не найдена
perlcritic: командата не е открита
perlcritic: 命令找不到
perlcritic: コマンドが見つかりません