icuinfo: 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 Debian possible default full paths are:

/usr/bin/icuinfo - from package: icu-devtools

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

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