shishid: 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 Debian possible default full paths are:

/usr/lib/debug/usr/sbin/shishid - from package: shishi-dbg
/usr/sbin/shishid - from package: shishi-kdc

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

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