slsh: 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 CentOS possible default full paths are:

/usr/bin/slsh - from package: slang-slsh

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/slsh - from package: slsh

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

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