c: 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:

/var/lib/wims/public_html/bin/c - from package: wims

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

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