ca-legacy: 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/ca-legacy - from package: ca-certificates

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

psssst... Do you have issue with CA root certificates on your system? Is it a DirectAdmin server? check out this post: DirectAdmin x509: certificate has expired

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