check-catalog.sh: 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/share/dotlrn/packages/acs-lang/bin/check-catalog.sh - from package: dotlrn
/usr/share/openacs/packages/acs-lang/bin/check-catalog.sh - from package: openacs

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

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