delcr: 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/delcr - from package: ucspi-tcp-ipv6
/usr/bin/delcr - from package: ucspi-tcp

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

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