cvstrim: command not found

Have You tried accessing the binary with the full path?

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/cvstrim - from package: cvsutils

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