ttf2pt1_showdf: 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/ttf2pt1_showdf - from package: ttf2pt1

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

Error in other languages:
ttf2pt1_showdf: bevel nie gevind nie
ttf2pt1_showdf: comandă negăsită
ttf2pt1_showdf: comando não encontrado
ttf2pt1_showdf: commande introuvable
ttf2pt1_showdf: command not found
ttf2pt1_showdf: käsku ei ole
ttf2pt1_showdf: không tìm thấy lệnh
ttf2pt1_showdf: komanda nerasta
ttf2pt1_showdf: Kommando nicht gefunden.
ttf2pt1_showdf: kommandot finns inte
ttf2pt1_showdf: komut yok
ttf2pt1_showdf: nie znaleziono polecenia
ttf2pt1_showdf: níor aimsíodh an t-ordú
ttf2pt1_showdf: no se encontró la orden
ttf2pt1_showdf: no s'ha trobat l'ordre
ttf2pt1_showdf: opdracht niet gevonden
ttf2pt1_showdf: parancs nem található
ttf2pt1_showdf: perintah tidak ditemukan
ttf2pt1_showdf: príkaz nenájdený
ttf2pt1_showdf: příkaz nenalezen
ttf2pt1_showdf: команда не найдена
ttf2pt1_showdf: командата не е открита
ttf2pt1_showdf: 命令找不到
ttf2pt1_showdf: コマンドが見つかりません