pnmtofiasco: 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/pnmtofiasco - from package: netpbm-progs

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

On Debian possible default full paths are:

/usr/bin/pnmtofiasco - from package: netpbm

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

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