tigexp: 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/sbin/tigexp - from package: tiger

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

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