gsim85: 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/gsim85 - from package: gsim85

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

Error in other languages:
gsim85: bevel nie gevind nie
gsim85: comandă negăsită
gsim85: comando não encontrado
gsim85: commande introuvable
gsim85: command not found
gsim85: käsku ei ole
gsim85: không tìm thấy lệnh
gsim85: komanda nerasta
gsim85: Kommando nicht gefunden.
gsim85: kommandot finns inte
gsim85: komut yok
gsim85: nie znaleziono polecenia
gsim85: níor aimsíodh an t-ordú
gsim85: no se encontró la orden
gsim85: no s'ha trobat l'ordre
gsim85: opdracht niet gevonden
gsim85: parancs nem található
gsim85: perintah tidak ditemukan
gsim85: príkaz nenájdený
gsim85: příkaz nenalezen
gsim85: команда не найдена
gsim85: командата не е открита
gsim85: 命令找不到
gsim85: コマンドが見つかりません