fsed.cpm: command not found

Have You tried accessing the binary with the full path?

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/fsed.cpm - from package: cpmtools

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

On Debian possible default full paths are:

/usr/bin/fsed.cpm - from package: cpmtools

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