tessrun: 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/bin/tessrun - from package: slang-tess

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

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