zmore: 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/zmore - from package: gzip

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

On Debian possible default full paths are:

/bin/zmore - from package: gzip

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

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