mysqlshow: 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/mysqlshow - from package: mysql55w
/usr/bin/mysqlshow - from package: mysql

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

On Debian possible default full paths are:

/usr/bin/mysqlshow - from package: mariadb-client-10.0
/usr/bin/mysqlshow - from package: mysql-client-5.5

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

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