softhsm-keyconv: command not found

Have You tried accessing the binary with the full path?

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/softhsm-keyconv - from package: softhsm

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

On Debian possible default full paths are:

/usr/bin/softhsm-keyconv - from package: softhsm
/usr/lib/debug/usr/bin/softhsm-keyconv - from package: softhsm-dbg

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