pnmcut: 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/pnmcut - from package: netpbm-progs

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

On Debian possible default full paths are:

/usr/bin/pnmcut - from package: netpbm

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

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