typer: 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/typer - from package: erlang-typer
/usr/lib64/erlang/bin/typer - from package: erlang-typer
/usr/lib64/erlang/erts-5.8.5/bin/typer - from package: erlang-typer

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

On Debian possible default full paths are:

/usr/bin/typer - from package: erlang-typer
/usr/lib/erlang/bin/typer - from package: erlang-typer
/usr/lib/erlang/erts-6.2/bin/typer - from package: erlang-typer
/usr/lib/debug/usr/lib/erlang/bin/typer - from package: erlang-dbg
/usr/lib/debug/usr/lib/erlang/erts-6.2/bin/typer - from package: erlang-dbg

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

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