ple-config: 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 Debian possible default full paths are:

/usr/bin/ple-config - from package: code-saturne-bin

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

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