openslide-quickhash1sum: 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/openslide-quickhash1sum - from package: openslide-tools

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

On Debian possible default full paths are:

/usr/bin/openslide-quickhash1sum - from package: openslide-tools

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

Error in other languages:
openslide-quickhash1sum: bevel nie gevind nie
openslide-quickhash1sum: comandă negăsită
openslide-quickhash1sum: comando não encontrado
openslide-quickhash1sum: commande introuvable
openslide-quickhash1sum: command not found
openslide-quickhash1sum: käsku ei ole
openslide-quickhash1sum: không tìm thấy lệnh
openslide-quickhash1sum: komanda nerasta
openslide-quickhash1sum: Kommando nicht gefunden.
openslide-quickhash1sum: kommandot finns inte
openslide-quickhash1sum: komut yok
openslide-quickhash1sum: nie znaleziono polecenia
openslide-quickhash1sum: níor aimsíodh an t-ordú
openslide-quickhash1sum: no se encontró la orden
openslide-quickhash1sum: no s'ha trobat l'ordre
openslide-quickhash1sum: opdracht niet gevonden
openslide-quickhash1sum: parancs nem található
openslide-quickhash1sum: perintah tidak ditemukan
openslide-quickhash1sum: príkaz nenájdený
openslide-quickhash1sum: příkaz nenalezen
openslide-quickhash1sum: команда не найдена
openslide-quickhash1sum: командата не е открита
openslide-quickhash1sum: 命令找不到
openslide-quickhash1sum: コマンドが見つかりません