yaz-icu: 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/yaz-icu - from package: yaz

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

On Debian possible default full paths are:

/usr/bin/yaz-icu - from package: yaz-icu

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

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