pbmtogo: 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/pbmtogo - from package: netpbm-progs

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

On Debian possible default full paths are:

/usr/bin/pbmtogo - from package: netpbm

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

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