commut: 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/lib/x86_64-linux-gnu/gap/pkg/guava/bin/leon/commut - from package: gap-guava-bin

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

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