jemalloc.sh: 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/jemalloc.sh - from package: jemalloc

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

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