src2man: 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/src2man - from package: txt2man

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

On Debian possible default full paths are:

/usr/bin/src2man - from package: txt2man

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

Error in other languages:
src2man: bevel nie gevind nie
src2man: comandă negăsită
src2man: comando não encontrado
src2man: commande introuvable
src2man: command not found
src2man: käsku ei ole
src2man: không tìm thấy lệnh
src2man: komanda nerasta
src2man: Kommando nicht gefunden.
src2man: kommandot finns inte
src2man: komut yok
src2man: nie znaleziono polecenia
src2man: níor aimsíodh an t-ordú
src2man: no se encontró la orden
src2man: no s'ha trobat l'ordre
src2man: opdracht niet gevonden
src2man: parancs nem található
src2man: perintah tidak ditemukan
src2man: príkaz nenájdený
src2man: příkaz nenalezen
src2man: команда не найдена
src2man: командата не е открита
src2man: 命令找不到
src2man: コマンドが見つかりません