sshfs: 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/sshfs - from package: fuse-sshfs

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

On Debian possible default full paths are:

/usr/bin/sshfs - from package: sshfs

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

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