catalina-tasks.xml: 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/share/tomcat6/bin/catalina-tasks.xml - from package: tomcat6
/usr/share/tomcat/bin/catalina-tasks.xml - from package: tomcat

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

On Debian possible default full paths are:

/usr/share/tomcat7/bin/catalina-tasks.xml - from package: tomcat7-common
/usr/share/tomcat8/bin/catalina-tasks.xml - from package: tomcat8-common

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

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