tomcat: 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/sbin/tomcat - from package: tomcat

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

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