icon-slicer: 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/icon-slicer - from package: icon-slicer

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

On Debian possible default full paths are:

/usr/bin/icon-slicer - from package: icon-slicer

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

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