shell_var: 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:

/lib/rc/bin/shell_var - from package: openrc

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

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