0install: 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/0install - from package: zeroinstall-injector

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

On Debian possible default full paths are:

/usr/bin/0install - from package: 0install-core

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

Error in other languages:
0install: bevel nie gevind nie
0install: comandă negăsită
0install: comando não encontrado
0install: commande introuvable
0install: command not found
0install: käsku ei ole
0install: không tìm thấy lệnh
0install: komanda nerasta
0install: Kommando nicht gefunden.
0install: kommandot finns inte
0install: komut yok
0install: nie znaleziono polecenia
0install: níor aimsíodh an t-ordú
0install: no se encontró la orden
0install: no s'ha trobat l'ordre
0install: opdracht niet gevonden
0install: parancs nem található
0install: perintah tidak ditemukan
0install: príkaz nenájdený
0install: příkaz nenalezen
0install: команда не найдена
0install: командата не е открита
0install: 命令找不到
0install: コマンドが見つかりません