zim: 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/zim - from package: Zim

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

On Debian possible default full paths are:

/usr/bin/zim - from package: Zim

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

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