tab2cin: 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/unicon/bin/tab2cin - from package: unicon-imc2

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

Error in other languages:
tab2cin: bevel nie gevind nie
tab2cin: comandă negăsită
tab2cin: comando não encontrado
tab2cin: commande introuvable
tab2cin: command not found
tab2cin: käsku ei ole
tab2cin: không tìm thấy lệnh
tab2cin: komanda nerasta
tab2cin: Kommando nicht gefunden.
tab2cin: kommandot finns inte
tab2cin: komut yok
tab2cin: nie znaleziono polecenia
tab2cin: níor aimsíodh an t-ordú
tab2cin: no se encontró la orden
tab2cin: no s'ha trobat l'ordre
tab2cin: opdracht niet gevonden
tab2cin: parancs nem található
tab2cin: perintah tidak ditemukan
tab2cin: príkaz nenájdený
tab2cin: příkaz nenalezen
tab2cin: команда не найдена
tab2cin: командата не е открита
tab2cin: 命令找不到
tab2cin: コマンドが見つかりません