lchsh: 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/lchsh - from package: libuser

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

On Debian possible default full paths are:

/usr/bin/lchsh - from package: libuser

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

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