gsl-randist: 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/gsl-randist - from package: gsl

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

On Debian possible default full paths are:

/usr/bin/gsl-randist - from package: gsl-bin

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

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